Http error code 524

The 524 A Timeout Occurred error is a Cloudflare-specific HTTP status code that indicates that the connection to the server has been closed due to a timeout. Depending on the context, an Error 524 message might prevent you from loading a web page, signing in to an online gaming platform, or using a piece of software. Or, the game or application might work fine when you’re using it offline, and 524 A Timeout Occurred might show up only when you try accessing an online feature. 524 A Timeout Occurred errors are almost always displayed on two lines like this: Error 524A timeout occurred Note: Error 524 messages can be seen on any device running any operating system. Error 524 Causes Error 524 messages are seen in situations involving Cloudflare. The error means that Cloudflare established a connection to the server it's supposed to communicate with, but the server took too long to respond. If you see this error while trying to access a website or a certain feature in an app, there’s little you can do as the visitor except notify the owner of the service or app. There are exceptions to this, however, as you’ll see below. On the other hand, if you’re the owner of a website that’s receiving the 524 A Timeout Occurred error, there are a few things you can try to fix it. How to Fix the 524 A Timeout Occurred Error Refresh the web page if you see the error in your browser, or shut down and restart the program if the Error 524 is seen there. This could be a temporary problem that a simple restart will fix. Completely uninstall the program and then reinstall it again by downloading the most recent version from the company’s website or installation disc. Some users have reported that this fixed their 524 error since it reestablished a connection to the server, but this method is probably only helpful if the 524 error occurs in a non-browser program, like an application that connects to a gaming server. If you get the error when using the Origin gaming platform, it could be related to restrictions built-in to your account. Child accounts are restricted; they don’t let you play online, communicate with friends, download games from the Origin store, and more. If this is the reason you’re seeing the error code 524, you have to log in to the child account to upgrade it to a full/adult account. But apart from changing the date of birth of the account holder, this is only possible once you’re no longer considered underage. You’ll be notified when the child account is eligible for an upgrade. Depending on the popularity of the website or service, the 524 error could be due to a sudden influx of visitors that the site wasn’t expecting, which could put a strain on the server resources, resulting in this timeout error. Waiting it out is all you can do in this case. Tip: If the website is down because of the 524 error message, you might be able to access an archived version of it by searching for the page on Wayback Machine. Are You the Website Owner? Follow these steps if you're the owner of the website or if you have the proper credentials to make server-side changes. Disable all your website plugins and then repeat the action that showed the Error 524 message. If this fixes the error, enable the plugins again, one by one, until you can pinpoint which one is causing the 524 A Timeout Occurred error. An increased server load due to a DDoS attack may be the cause of the 524 error, in which case you could enable DDos protection through Cloudflare. If the Error 524 message is due to your website suddenly getting more legitimate traffic, consider upgrading your hosting plan to accommodate the extra resources needed to serve that number of visitors. Move any long-running processes to a subdomain not proxied (gray clouded) in the Cloudflare DNS app. Any HTTP request that doesn't receive a response from the origin server for over 100 seconds (or over 600 seconds for enterprise customers) will be timed out and you'll see the 524 A Timeout Occurred error. Some Error 524 messages are caused by something out of your control. Contact your hosting provider and give them the error code, timezone the 524 error occurred in, and the URL that resulted in the error. They might need to check server logs and memory levels.

The 524 A Timeout Occurred error is a Cloudflare-specific HTTP status code that indicates that the connection to the server has been closed due to a timeout.

Depending on the context, an Error 524 message might prevent you from loading a web page, signing in to an online gaming platform, or using a piece of software.

Or, the game or application might work fine when you’re using it offline, and 524 A Timeout Occurred might show up only when you try accessing an online feature.

524 A Timeout Occurred errors are almost always displayed on two lines like this:

Error 524
A timeout occurred

Error 524 from Cloudflare

Note: Error 524 messages can be seen on any device running any operating system.

Error 524 Causes

Error 524 messages are seen in situations involving Cloudflare. The error means that Cloudflare established a connection to the server it’s supposed to communicate with, but the server took too long to respond.

If you see this error while trying to access a website or a certain feature in an app, there’s little you can do as the visitor except notify the owner of the service or app. There are exceptions to this, however, as you’ll see below.

On the other hand, if you’re the owner of a website that’s receiving the 524 A Timeout Occurred error, there are a few things you can try to fix it.

How to Fix the 524 A Timeout Occurred Error

  1. Refresh the web page if you see the error in your browser, or shut down and restart the program if the Error 524 is seen there. This could be a temporary problem that a simple restart will fix.
  2. Completely uninstall the program and then reinstall it again by downloading the most recent version from the company’s website or installation disc.
  3. Some users have reported that this fixed their 524 error since it reestablished a connection to the server, but this method is probably only helpful if the 524 error occurs in a non-browser program, like an application that connects to a gaming server.
  4. If you get the error when using the Origin gaming platform, it could be related to restrictions built-in to your account. Child accounts are restricted; they don’t let you play online, communicate with friends, download games from the Origin store, and more.
  5. If this is the reason you’re seeing the error code 524, you have to log in to the child account to upgrade it to a full/adult account. But apart from changing the date of birth of the account holder, this is only possible once you’re no longer considered underage. You’ll be notified when the child account is eligible for an upgrade.
  6. Depending on the popularity of the website or service, the 524 error could be due to a sudden influx of visitors that the site wasn’t expecting, which could put a strain on the server resources, resulting in this timeout error.

Waiting it out is all you can do in this case.

Tip: If the website is down because of the 524 error message, you might be able to access an archived version of it by searching for the page on Wayback Machine.

Are You the Website Owner?

Follow these steps if you’re the owner of the website or if you have the proper credentials to make server-side changes.

  1. Disable all your website plugins and then repeat the action that showed the Error 524 message. If this fixes the error, enable the plugins again, one by one, until you can pinpoint which one is causing the 524 A Timeout Occurred error.
  2. An increased server load due to a DDoS attack may be the cause of the 524 error, in which case you could enable DDos protection through Cloudflare.
  3. If the Error 524 message is due to your website suddenly getting more legitimate traffic, consider upgrading your hosting plan to accommodate the extra resources needed to serve that number of visitors.
  4. Move any long-running processes to a subdomain not proxied (gray clouded) in the Cloudflare DNS app. Any HTTP request that doesn’t receive a response from the origin server for over 100 seconds (or over 600 seconds for enterprise customers) will be timed out and you’ll see the 524 A Timeout Occurred error.
  5. Some Error 524 messages are caused by something out of your control. Contact your hosting provider and give them the error code, timezone the 524 error occurred in, and the URL that resulted in the error. They might need to check server logs and memory levels.
Источник

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From Wikipedia, the free encyclopedia

This is a list of Hypertext Transfer Protocol (HTTP) response status codes. Status codes are issued by a server in response to a client’s request made to the server. It includes codes from IETF Request for Comments (RFCs), other specifications, and some additional codes used in some common applications of the HTTP. The first digit of the status code specifies one of five standard classes of responses. The optional message phrases shown are typical, but any human-readable alternative may be provided, or none at all.

Unless otherwise stated, the status code is part of the HTTP standard (RFC 9110).

The Internet Assigned Numbers Authority (IANA) maintains the official registry of HTTP status codes.[1]

All HTTP response status codes are separated into five classes or categories. The first digit of the status code defines the class of response, while the last two digits do not have any classifying or categorization role. There are five classes defined by the standard:

  • 1xx informational response – the request was received, continuing process
  • 2xx successful – the request was successfully received, understood, and accepted
  • 3xx redirection – further action needs to be taken in order to complete the request
  • 4xx client error – the request contains bad syntax or cannot be fulfilled
  • 5xx server error – the server failed to fulfil an apparently valid request

1xx informational response

An informational response indicates that the request was received and understood. It is issued on a provisional basis while request processing continues. It alerts the client to wait for a final response. The message consists only of the status line and optional header fields, and is terminated by an empty line. As the HTTP/1.0 standard did not define any 1xx status codes, servers must not[note 1] send a 1xx response to an HTTP/1.0 compliant client except under experimental conditions.

100 Continue
The server has received the request headers and the client should proceed to send the request body (in the case of a request for which a body needs to be sent; for example, a POST request). Sending a large request body to a server after a request has been rejected for inappropriate headers would be inefficient. To have a server check the request’s headers, a client must send Expect: 100-continue as a header in its initial request and receive a 100 Continue status code in response before sending the body. If the client receives an error code such as 403 (Forbidden) or 405 (Method Not Allowed) then it should not send the request’s body. The response 417 Expectation Failed indicates that the request should be repeated without the Expect header as it indicates that the server does not support expectations (this is the case, for example, of HTTP/1.0 servers).[2]
101 Switching Protocols
The requester has asked the server to switch protocols and the server has agreed to do so.
102 Processing (WebDAV; RFC 2518)
A WebDAV request may contain many sub-requests involving file operations, requiring a long time to complete the request. This code indicates that the server has received and is processing the request, but no response is available yet.[3] This prevents the client from timing out and assuming the request was lost.
103 Early Hints (RFC 8297)
Used to return some response headers before final HTTP message.[4]

2xx success

This class of status codes indicates the action requested by the client was received, understood, and accepted.[1]

200 OK
Standard response for successful HTTP requests. The actual response will depend on the request method used. In a GET request, the response will contain an entity corresponding to the requested resource. In a POST request, the response will contain an entity describing or containing the result of the action.
201 Created
The request has been fulfilled, resulting in the creation of a new resource.[5]
202 Accepted
The request has been accepted for processing, but the processing has not been completed. The request might or might not be eventually acted upon, and may be disallowed when processing occurs.
203 Non-Authoritative Information (since HTTP/1.1)
The server is a transforming proxy (e.g. a Web accelerator) that received a 200 OK from its origin, but is returning a modified version of the origin’s response.[6][7]
204 No Content
The server successfully processed the request, and is not returning any content.
205 Reset Content
The server successfully processed the request, asks that the requester reset its document view, and is not returning any content.
206 Partial Content
The server is delivering only part of the resource (byte serving) due to a range header sent by the client. The range header is used by HTTP clients to enable resuming of interrupted downloads, or split a download into multiple simultaneous streams.
207 Multi-Status (WebDAV; RFC 4918)
The message body that follows is by default an XML message and can contain a number of separate response codes, depending on how many sub-requests were made.[8]
208 Already Reported (WebDAV; RFC 5842)
The members of a DAV binding have already been enumerated in a preceding part of the (multistatus) response, and are not being included again.
226 IM Used (RFC 3229)
The server has fulfilled a request for the resource, and the response is a representation of the result of one or more instance-manipulations applied to the current instance.[9]

3xx redirection

This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection.[1]

A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD. A user agent may automatically redirect a request. A user agent should detect and intervene to prevent cyclical redirects.[10]

300 Multiple Choices
Indicates multiple options for the resource from which the client may choose (via agent-driven content negotiation). For example, this code could be used to present multiple video format options, to list files with different filename extensions, or to suggest word-sense disambiguation.
301 Moved Permanently
This and all future requests should be directed to the given URI.
302 Found (Previously «Moved temporarily»)
Tells the client to look at (browse to) another URL. The HTTP/1.0 specification (RFC 1945) required the client to perform a temporary redirect with the same method (the original describing phrase was «Moved Temporarily»),[11] but popular browsers implemented 302 redirects by changing the method to GET. Therefore, HTTP/1.1 added status codes 303 and 307 to distinguish between the two behaviours.[10]
303 See Other (since HTTP/1.1)
The response to the request can be found under another URI using the GET method. When received in response to a POST (or PUT/DELETE), the client should presume that the server has received the data and should issue a new GET request to the given URI.
304 Not Modified
Indicates that the resource has not been modified since the version specified by the request headers If-Modified-Since or If-None-Match. In such case, there is no need to retransmit the resource since the client still has a previously-downloaded copy.
305 Use Proxy (since HTTP/1.1)
The requested resource is available only through a proxy, the address for which is provided in the response. For security reasons, many HTTP clients (such as Mozilla Firefox and Internet Explorer) do not obey this status code.
306 Switch Proxy
No longer used. Originally meant «Subsequent requests should use the specified proxy.»
307 Temporary Redirect (since HTTP/1.1)
In this case, the request should be repeated with another URI; however, future requests should still use the original URI. In contrast to how 302 was historically implemented, the request method is not allowed to be changed when reissuing the original request. For example, a POST request should be repeated using another POST request.
308 Permanent Redirect
This and all future requests should be directed to the given URI. 308 parallel the behaviour of 301, but does not allow the HTTP method to change. So, for example, submitting a form to a permanently redirected resource may continue smoothly.

4xx client errors

A The Wikimedia 404 message

This class of status code is intended for situations in which the error seems to have been caused by the client. Except when responding to a HEAD request, the server should include an entity containing an explanation of the error situation, and whether it is a temporary or permanent condition. These status codes are applicable to any request method. User agents should display any included entity to the user.

400 Bad Request
The server cannot or will not process the request due to an apparent client error (e.g., malformed request syntax, size too large, invalid request message framing, or deceptive request routing).
401 Unauthorized
Similar to 403 Forbidden, but specifically for use when authentication is required and has failed or has not yet been provided. The response must include a WWW-Authenticate header field containing a challenge applicable to the requested resource. See Basic access authentication and Digest access authentication. 401 semantically means «unauthorised», the user does not have valid authentication credentials for the target resource.
Some sites incorrectly issue HTTP 401 when an IP address is banned from the website (usually the website domain) and that specific address is refused permission to access a website.[citation needed]
402 Payment Required
Reserved for future use. The original intention was that this code might be used as part of some form of digital cash or micropayment scheme, as proposed, for example, by GNU Taler,[13] but that has not yet happened, and this code is not widely used. Google Developers API uses this status if a particular developer has exceeded the daily limit on requests.[14] Sipgate uses this code if an account does not have sufficient funds to start a call.[15] Shopify uses this code when the store has not paid their fees and is temporarily disabled.[16] Stripe uses this code for failed payments where parameters were correct, for example blocked fraudulent payments.[17]
403 Forbidden
The request contained valid data and was understood by the server, but the server is refusing action. This may be due to the user not having the necessary permissions for a resource or needing an account of some sort, or attempting a prohibited action (e.g. creating a duplicate record where only one is allowed). This code is also typically used if the request provided authentication by answering the WWW-Authenticate header field challenge, but the server did not accept that authentication. The request should not be repeated.
404 Not Found
The requested resource could not be found but may be available in the future. Subsequent requests by the client are permissible.
405 Method Not Allowed
A request method is not supported for the requested resource; for example, a GET request on a form that requires data to be presented via POST, or a PUT request on a read-only resource.
406 Not Acceptable
The requested resource is capable of generating only content not acceptable according to the Accept headers sent in the request. See Content negotiation.
407 Proxy Authentication Required
The client must first authenticate itself with the proxy.
408 Request Timeout
The server timed out waiting for the request. According to HTTP specifications: «The client did not produce a request within the time that the server was prepared to wait. The client MAY repeat the request without modifications at any later time.»
409 Conflict
Indicates that the request could not be processed because of conflict in the current state of the resource, such as an edit conflict between multiple simultaneous updates.
410 Gone
Indicates that the resource requested was previously in use but is no longer available and will not be available again. This should be used when a resource has been intentionally removed and the resource should be purged. Upon receiving a 410 status code, the client should not request the resource in the future. Clients such as search engines should remove the resource from their indices. Most use cases do not require clients and search engines to purge the resource, and a «404 Not Found» may be used instead.
411 Length Required
The request did not specify the length of its content, which is required by the requested resource.
412 Precondition Failed
The server does not meet one of the preconditions that the requester put on the request header fields.
413 Payload Too Large
The request is larger than the server is willing or able to process. Previously called «Request Entity Too Large» in RFC 2616.[18]
414 URI Too Long
The URI provided was too long for the server to process. Often the result of too much data being encoded as a query-string of a GET request, in which case it should be converted to a POST request. Called «Request-URI Too Long» previously in RFC 2616.[19]
415 Unsupported Media Type
The request entity has a media type which the server or resource does not support. For example, the client uploads an image as image/svg+xml, but the server requires that images use a different format.
416 Range Not Satisfiable
The client has asked for a portion of the file (byte serving), but the server cannot supply that portion. For example, if the client asked for a part of the file that lies beyond the end of the file. Called «Requested Range Not Satisfiable» previously RFC 2616.[20]
417 Expectation Failed
The server cannot meet the requirements of the Expect request-header field.[21]
418 I’m a teapot (RFC 2324, RFC 7168)
This code was defined in 1998 as one of the traditional IETF April Fools’ jokes, in RFC 2324, Hyper Text Coffee Pot Control Protocol, and is not expected to be implemented by actual HTTP servers. The RFC specifies this code should be returned by teapots requested to brew coffee.[22] This HTTP status is used as an Easter egg in some websites, such as Google.com’s «I’m a teapot» easter egg.[23][24][25] Sometimes, this status code is also used as a response to a blocked request, instead of the more appropriate 403 Forbidden.[26][27]
421 Misdirected Request
The request was directed at a server that is not able to produce a response (for example because of connection reuse).
422 Unprocessable Entity
The request was well-formed but was unable to be followed due to semantic errors.[8]
423 Locked (WebDAV; RFC 4918)
The resource that is being accessed is locked.[8]
424 Failed Dependency (WebDAV; RFC 4918)
The request failed because it depended on another request and that request failed (e.g., a PROPPATCH).[8]
425 Too Early (RFC 8470)
Indicates that the server is unwilling to risk processing a request that might be replayed.
426 Upgrade Required
The client should switch to a different protocol such as TLS/1.3, given in the Upgrade header field.
428 Precondition Required (RFC 6585)
The origin server requires the request to be conditional. Intended to prevent the ‘lost update’ problem, where a client GETs a resource’s state, modifies it, and PUTs it back to the server, when meanwhile a third party has modified the state on the server, leading to a conflict.[28]
429 Too Many Requests (RFC 6585)
The user has sent too many requests in a given amount of time. Intended for use with rate-limiting schemes.[28]
431 Request Header Fields Too Large (RFC 6585)
The server is unwilling to process the request because either an individual header field, or all the header fields collectively, are too large.[28]
451 Unavailable For Legal Reasons (RFC 7725)
A server operator has received a legal demand to deny access to a resource or to a set of resources that includes the requested resource.[29] The code 451 was chosen as a reference to the novel Fahrenheit 451 (see the Acknowledgements in the RFC).

5xx server errors

The server failed to fulfil a request.

Response status codes beginning with the digit «5» indicate cases in which the server is aware that it has encountered an error or is otherwise incapable of performing the request. Except when responding to a HEAD request, the server should include an entity containing an explanation of the error situation, and indicate whether it is a temporary or permanent condition. Likewise, user agents should display any included entity to the user. These response codes are applicable to any request method.

500 Internal Server Error
A generic error message, given when an unexpected condition was encountered and no more specific message is suitable.
501 Not Implemented
The server either does not recognize the request method, or it lacks the ability to fulfil the request. Usually this implies future availability (e.g., a new feature of a web-service API).
502 Bad Gateway
The server was acting as a gateway or proxy and received an invalid response from the upstream server.
503 Service Unavailable
The server cannot handle the request (because it is overloaded or down for maintenance). Generally, this is a temporary state.[30]
504 Gateway Timeout
The server was acting as a gateway or proxy and did not receive a timely response from the upstream server.
505 HTTP Version Not Supported
The server does not support the HTTP version used in the request.
506 Variant Also Negotiates (RFC 2295)
Transparent content negotiation for the request results in a circular reference.[31]
507 Insufficient Storage (WebDAV; RFC 4918)
The server is unable to store the representation needed to complete the request.[8]
508 Loop Detected (WebDAV; RFC 5842)
The server detected an infinite loop while processing the request (sent instead of 208 Already Reported).
510 Not Extended (RFC 2774)
Further extensions to the request are required for the server to fulfill it.[32]
511 Network Authentication Required (RFC 6585)
The client needs to authenticate to gain network access. Intended for use by intercepting proxies used to control access to the network (e.g., «captive portals» used to require agreement to Terms of Service before granting full Internet access via a Wi-Fi hotspot).[28]

Unofficial codes

The following codes are not specified by any standard.

419 Page Expired (Laravel Framework)
Used by the Laravel Framework when a CSRF Token is missing or expired.
420 Method Failure (Spring Framework)
A deprecated response used by the Spring Framework when a method has failed.[33]
420 Enhance Your Calm (Twitter)
Returned by version 1 of the Twitter Search and Trends API when the client is being rate limited; versions 1.1 and later use the 429 Too Many Requests response code instead.[34] The phrase «Enhance your calm» comes from the 1993 movie Demolition Man, and its association with this number is likely a reference to cannabis.[citation needed]
430 Request Header Fields Too Large (Shopify)
Used by Shopify, instead of the 429 Too Many Requests response code, when too many URLs are requested within a certain time frame.[35]
450 Blocked by Windows Parental Controls (Microsoft)
The Microsoft extension code indicated when Windows Parental Controls are turned on and are blocking access to the requested webpage.[36]
498 Invalid Token (Esri)
Returned by ArcGIS for Server. Code 498 indicates an expired or otherwise invalid token.[37]
499 Token Required (Esri)
Returned by ArcGIS for Server. Code 499 indicates that a token is required but was not submitted.[37]
509 Bandwidth Limit Exceeded (Apache Web Server/cPanel)
The server has exceeded the bandwidth specified by the server administrator; this is often used by shared hosting providers to limit the bandwidth of customers.[38]
529 Site is overloaded
Used by Qualys in the SSLLabs server testing API to signal that the site can’t process the request.[39]
530 Site is frozen
Used by the Pantheon Systems web platform to indicate a site that has been frozen due to inactivity.[40]
598 (Informal convention) Network read timeout error
Used by some HTTP proxies to signal a network read timeout behind the proxy to a client in front of the proxy.[41]
599 Network Connect Timeout Error
An error used by some HTTP proxies to signal a network connect timeout behind the proxy to a client in front of the proxy.

Internet Information Services

Microsoft’s Internet Information Services (IIS) web server expands the 4xx error space to signal errors with the client’s request.

440 Login Time-out
The client’s session has expired and must log in again.[42]
449 Retry With
The server cannot honour the request because the user has not provided the required information.[43]
451 Redirect
Used in Exchange ActiveSync when either a more efficient server is available or the server cannot access the users’ mailbox.[44] The client is expected to re-run the HTTP AutoDiscover operation to find a more appropriate server.[45]

IIS sometimes uses additional decimal sub-codes for more specific information,[46] however these sub-codes only appear in the response payload and in documentation, not in the place of an actual HTTP status code.

nginx

The nginx web server software expands the 4xx error space to signal issues with the client’s request.[47][48]

444 No Response
Used internally[49] to instruct the server to return no information to the client and close the connection immediately.
494 Request header too large
Client sent too large request or too long header line.
495 SSL Certificate Error
An expansion of the 400 Bad Request response code, used when the client has provided an invalid client certificate.
496 SSL Certificate Required
An expansion of the 400 Bad Request response code, used when a client certificate is required but not provided.
497 HTTP Request Sent to HTTPS Port
An expansion of the 400 Bad Request response code, used when the client has made a HTTP request to a port listening for HTTPS requests.
499 Client Closed Request
Used when the client has closed the request before the server could send a response.

Cloudflare

Cloudflare’s reverse proxy service expands the 5xx series of errors space to signal issues with the origin server.[50]

520 Web Server Returned an Unknown Error
The origin server returned an empty, unknown, or unexpected response to Cloudflare.[51]
521 Web Server Is Down
The origin server refused connections from Cloudflare. Security solutions at the origin may be blocking legitimate connections from certain Cloudflare IP addresses.
522 Connection Timed Out
Cloudflare timed out contacting the origin server.
523 Origin Is Unreachable
Cloudflare could not reach the origin server; for example, if the DNS records for the origin server are incorrect or missing.
524 A Timeout Occurred
Cloudflare was able to complete a TCP connection to the origin server, but did not receive a timely HTTP response.
525 SSL Handshake Failed
Cloudflare could not negotiate a SSL/TLS handshake with the origin server.
526 Invalid SSL Certificate
Cloudflare could not validate the SSL certificate on the origin web server. Also used by Cloud Foundry’s gorouter.
527 Railgun Error
Error 527 indicates an interrupted connection between Cloudflare and the origin server’s Railgun server.[52]
530
Error 530 is returned along with a 1xxx error.[53]

AWS Elastic Load Balancer

Amazon’s Elastic Load Balancing adds a few custom return codes

460
Client closed the connection with the load balancer before the idle timeout period elapsed. Typically when client timeout is sooner than the Elastic Load Balancer’s timeout.[54]
463
The load balancer received an X-Forwarded-For request header with more than 30 IP addresses.[54]
561 Unauthorized
An error around authentication returned by a server registered with a load balancer. You configured a listener rule to authenticate users, but the identity provider (IdP) returned an error code when authenticating the user.[55]

Caching warning codes (obsoleted)

The following caching related warning codes were specified under RFC 7234. Unlike the other status codes above, these were not sent as the response status in the HTTP protocol, but as part of the «Warning» HTTP header.[56][57]

Since this «Warning» header is often neither sent by servers nor acknowledged by clients, this header and its codes were obsoleted by the HTTP Working Group in 2022 with RFC 9111.[58]

110 Response is Stale
The response provided by a cache is stale (the content’s age exceeds a maximum age set by a Cache-Control header or heuristically chosen lifetime).
111 Revalidation Failed
The cache was unable to validate the response, due to an inability to reach the origin server.
112 Disconnected Operation
The cache is intentionally disconnected from the rest of the network.
113 Heuristic Expiration
The cache heuristically chose a freshness lifetime greater than 24 hours and the response’s age is greater than 24 hours.
199 Miscellaneous Warning
Arbitrary, non-specific warning. The warning text may be logged or presented to the user.
214 Transformation Applied
Added by a proxy if it applies any transformation to the representation, such as changing the content encoding, media type or the like.
299 Miscellaneous Persistent Warning
Same as 199, but indicating a persistent warning.

See also

  • Custom error pages
  • List of FTP server return codes
  • List of HTTP header fields
  • List of SMTP server return codes
  • Common Log Format

Explanatory notes

  1. ^ Emphasised words and phrases such as must and should represent interpretation guidelines as given by RFC 2119

References

  1. ^ a b c «Hypertext Transfer Protocol (HTTP) Status Code Registry». Iana.org. Archived from the original on December 11, 2011. Retrieved January 8, 2015.
  2. ^ «RFC 9110: HTTP Semantics and Content, Section 10.1.1 «Expect»«.
  3. ^ Goland, Yaronn; Whitehead, Jim; Faizi, Asad; Carter, Steve R.; Jensen, Del (February 1999). HTTP Extensions for Distributed Authoring – WEBDAV. IETF. doi:10.17487/RFC2518. RFC 2518. Retrieved October 24, 2009.
  4. ^ Oku, Kazuho (December 2017). An HTTP Status Code for Indicating Hints. IETF. doi:10.17487/RFC8297. RFC 8297. Retrieved December 20, 2017.
  5. ^ Stewart, Mark; djna. «Create request with POST, which response codes 200 or 201 and content». Stack Overflow. Archived from the original on October 11, 2016. Retrieved October 16, 2015.
  6. ^ «RFC 9110: HTTP Semantics and Content, Section 15.3.4».
  7. ^ «RFC 9110: HTTP Semantics and Content, Section 7.7».
  8. ^ a b c d e Dusseault, Lisa, ed. (June 2007). HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV). IETF. doi:10.17487/RFC4918. RFC 4918. Retrieved October 24, 2009.
  9. ^ Delta encoding in HTTP. IETF. January 2002. doi:10.17487/RFC3229. RFC 3229. Retrieved February 25, 2011.
  10. ^ a b «RFC 9110: HTTP Semantics and Content, Section 15.4 «Redirection 3xx»«.
  11. ^ Berners-Lee, Tim; Fielding, Roy T.; Nielsen, Henrik Frystyk (May 1996). Hypertext Transfer Protocol – HTTP/1.0. IETF. doi:10.17487/RFC1945. RFC 1945. Retrieved October 24, 2009.
  12. ^ «The GNU Taler tutorial for PHP Web shop developers 0.4.0». docs.taler.net. Archived from the original on November 8, 2017. Retrieved October 29, 2017.
  13. ^ «Google API Standard Error Responses». 2016. Archived from the original on May 25, 2017. Retrieved June 21, 2017.
  14. ^ «Sipgate API Documentation». Archived from the original on July 10, 2018. Retrieved July 10, 2018.
  15. ^ «Shopify Documentation». Archived from the original on July 25, 2018. Retrieved July 25, 2018.
  16. ^ «Stripe API Reference – Errors». stripe.com. Retrieved October 28, 2019.
  17. ^ «RFC2616 on status 413». Tools.ietf.org. Archived from the original on March 7, 2011. Retrieved November 11, 2015.
  18. ^ «RFC2616 on status 414». Tools.ietf.org. Archived from the original on March 7, 2011. Retrieved November 11, 2015.
  19. ^ «RFC2616 on status 416». Tools.ietf.org. Archived from the original on March 7, 2011. Retrieved November 11, 2015.
  20. ^ TheDeadLike. «HTTP/1.1 Status Codes 400 and 417, cannot choose which». serverFault. Archived from the original on October 10, 2015. Retrieved October 16, 2015.
  21. ^ Larry Masinter (April 1, 1998). Hyper Text Coffee Pot Control Protocol (HTCPCP/1.0). doi:10.17487/RFC2324. RFC 2324. Any attempt to brew coffee with a teapot should result in the error code «418 I’m a teapot». The resulting entity body MAY be short and stout.
  22. ^ I’m a teapot
  23. ^ Barry Schwartz (August 26, 2014). «New Google Easter Egg For SEO Geeks: Server Status 418, I’m A Teapot». Search Engine Land. Archived from the original on November 15, 2015. Retrieved November 4, 2015.
  24. ^ «Google’s Teapot». Retrieved October 23, 2017.[dead link]
  25. ^ «Enable extra web security on a website». DreamHost. Retrieved December 18, 2022.
  26. ^ «I Went to a Russian Website and All I Got Was This Lousy Teapot». PCMag. Retrieved December 18, 2022.
  27. ^ a b c d Nottingham, M.; Fielding, R. (April 2012). «RFC 6585 – Additional HTTP Status Codes». Request for Comments. Internet Engineering Task Force. Archived from the original on May 4, 2012. Retrieved May 1, 2012.
  28. ^ Bray, T. (February 2016). «An HTTP Status Code to Report Legal Obstacles». ietf.org. Archived from the original on March 4, 2016. Retrieved March 7, 2015.
  29. ^ alex. «What is the correct HTTP status code to send when a site is down for maintenance?». Stack Overflow. Archived from the original on October 11, 2016. Retrieved October 16, 2015.
  30. ^ Holtman, Koen; Mutz, Andrew H. (March 1998). Transparent Content Negotiation in HTTP. IETF. doi:10.17487/RFC2295. RFC 2295. Retrieved October 24, 2009.
  31. ^ Nielsen, Henrik Frystyk; Leach, Paul; Lawrence, Scott (February 2000). An HTTP Extension Framework. IETF. doi:10.17487/RFC2774. RFC 2774. Retrieved October 24, 2009.
  32. ^ «Enum HttpStatus». Spring Framework. org.springframework.http. Archived from the original on October 25, 2015. Retrieved October 16, 2015.
  33. ^ «Twitter Error Codes & Responses». Twitter. 2014. Archived from the original on September 27, 2017. Retrieved January 20, 2014.
  34. ^ «HTTP Status Codes and SEO: what you need to know». ContentKing. Retrieved August 9, 2019.
  35. ^ «Screenshot of error page». Archived from the original (bmp) on May 11, 2013. Retrieved October 11, 2009.
  36. ^ a b «Using token-based authentication». ArcGIS Server SOAP SDK. Archived from the original on September 26, 2014. Retrieved September 8, 2014.
  37. ^ «HTTP Error Codes and Quick Fixes». Docs.cpanel.net. Archived from the original on November 23, 2015. Retrieved October 15, 2015.
  38. ^ «SSL Labs API v3 Documentation». github.com.
  39. ^ «Platform Considerations | Pantheon Docs». pantheon.io. Archived from the original on January 6, 2017. Retrieved January 5, 2017.
  40. ^ «HTTP status codes — ascii-code.com». www.ascii-code.com. Archived from the original on January 7, 2017. Retrieved December 23, 2016.
  41. ^
    «Error message when you try to log on to Exchange 2007 by using Outlook Web Access: «440 Login Time-out»«. Microsoft. 2010. Retrieved November 13, 2013.
  42. ^ «2.2.6 449 Retry With Status Code». Microsoft. 2009. Archived from the original on October 5, 2009. Retrieved October 26, 2009.
  43. ^ «MS-ASCMD, Section 3.1.5.2.2». Msdn.microsoft.com. Archived from the original on March 26, 2015. Retrieved January 8, 2015.
  44. ^ «Ms-oxdisco». Msdn.microsoft.com. Archived from the original on July 31, 2014. Retrieved January 8, 2015.
  45. ^ «The HTTP status codes in IIS 7.0». Microsoft. July 14, 2009. Archived from the original on April 9, 2009. Retrieved April 1, 2009.
  46. ^ «ngx_http_request.h». nginx 1.9.5 source code. nginx inc. Archived from the original on September 19, 2017. Retrieved January 9, 2016.
  47. ^ «ngx_http_special_response.c». nginx 1.9.5 source code. nginx inc. Archived from the original on May 8, 2018. Retrieved January 9, 2016.
  48. ^ «return» directive Archived March 1, 2018, at the Wayback Machine (http_rewrite module) documentation.
  49. ^ «Troubleshooting: Error Pages». Cloudflare. Archived from the original on March 4, 2016. Retrieved January 9, 2016.
  50. ^ «Error 520: web server returns an unknown error». Cloudflare. Retrieved November 1, 2019.
  51. ^ «527 Error: Railgun Listener to origin error». Cloudflare. Archived from the original on October 13, 2016. Retrieved October 12, 2016.
  52. ^ «Error 530». Cloudflare. Retrieved November 1, 2019.
  53. ^ a b «Troubleshoot Your Application Load Balancers – Elastic Load Balancing». docs.aws.amazon.com. Retrieved August 27, 2019.
  54. ^ «Troubleshoot your Application Load Balancers — Elastic Load Balancing». docs.aws.amazon.com. Retrieved January 24, 2021.
  55. ^ «Hypertext Transfer Protocol (HTTP/1.1): Caching». datatracker.ietf.org. Retrieved September 25, 2021.
  56. ^ «Warning — HTTP | MDN». developer.mozilla.org. Retrieved August 15, 2021. CC BY-SA icon.svg Some text was copied from this source, which is available under a Creative Commons Attribution-ShareAlike 2.5 Generic (CC BY-SA 2.5) license.
  57. ^ «RFC 9111: HTTP Caching, Section 5.5 «Warning»«. June 2022.

External links

  • «RFC 9110: HTTP Semantics and Content, Section 15 «Status Codes»«.
  • Hypertext Transfer Protocol (HTTP) Status Code Registry
Источник

Ошибки 520, 521, 522, 524 связаны с проблемами в работе сервиса CloudFlare.

CloudFlare — сервис для перенаправления трафика на сайт с помощью облачного прокси-сервера, который обеспечивает дополнительную защиту от DDoS-атак и ускоряет загрузку вашего сайта.

Ошибка 520 Unknown Error

Что означает ошибка 520? Система CloudFlare выдаёт 520 ошибку, если не может обработать ответ от веб-сервера, на котором расположен сайт:

Причины появления ошибки:

  • сброс соединения (после успешного запроса сервер разорвал соединение);
  • заголовок запроса превышает ограничение размера заголовка Cloudflare (более 8 КБ). Если у вас много файлов cookie или они очень большие, это может привести к увеличению размера заголовков. Так как у Cloudflare есть ограничение на размер заголовка в 8 КБ, он не может обработать длинный заголовок;
  • пустой ответ от сервера. Это происходит, когда DNS домена указывают на неправильный сервер.
  • некорректный ответ от сервера;
  • система безопасности блокирует запросы. Укажите IP-адреса Cloudflare в белом списке, чтобы система не блокировала запросы.

Способы устранения ошибки:

  1. Отключить CloudFlare. Так вы сможете понять, где находится ошибка (на сервере или в CloudFlare).
  2. Удалить плагины. Для плагинов иногда требуется много файлов cookies. Если на сайте много плагинов, это может повлиять на размер заголовков. Они могут быть слишком большими по размеру, и Cloudflare не справится с ними. Чтобы исправить ошибку, отключите плагины один за другим. Если ошибка пропадёт, удалите некоторые из плагинов.
  3. Проверьте настройки DNS в CloudFlare. Убедитесь, что запись A указывает на правильный IP-адрес.

Подробные рекомендации по исправлению ошибки 520 даны в справке CloudFlare.

Ошибка 521 Web Server Is Down

Код ошибки 521 возникает, когда веб-сервер обрывает соединение с CloudFlare:

Это может произойти в двух случаях:

  • сервер не отвечает или недоступен. Необходимо проверить работоспособность сервера;
  • веб-сервер блокирует запросы CloudFlare. Поскольку CloudFlare работает как обратный прокси-сервер, все запросы к серверам поступают от IP-адресов CloudFlare. Иногда система безопасности хостинга принимает постоянные подключения с одних и тех же IP-адресов за DDoS-атаку. В результате на IP-адреса CloudFlare накладывается блокировка/ограничения по скорости.

Диапазон IP-адресов CloudFlare вы можете увидеть по ссылке.

Рекомендации по исправлению ошибки 521 даны в справке CloudFlare.

Ошибка 522 Connection timed out

Ошибка 522 возникает, если превышено время ожидания ответа от веб-сервера и пользователь не может попасть на страницу:

Основные причины:

  • веб-сервер перегружен и не ответил на запрос,
  • на веб-сервере стоит система защиты, которая блокирует запросы от CloudFlare,
  • веб-сервер недоступен,
  • некорректный IP-адрес, установленный в настройках DNS на CloudFlare (Запрос от CloudFlare был отправлен на другой IP),
  • проблемы с маршрутизацией сети между CloudFlare и веб-сервером.

Что делать? Для решения проблемы удостоверьтесь, что ваш веб-сервер активен и принимает HTTP-запросы. Проверьте, корректны ли настройки DNS в Личном кабинете на CloudFlare.

Подробные рекомендации по исправлению ошибки 522 даны в справке CloudFlare.

Как исправить ошибку 522 в Google Chrome

Методы решения:

  1. Очистите кеш браузера. Браузер может быть переполнен данными о посещении сайтов. Освободите место в кэше браузера по инструкции.
  2. Удалите расширение браузера, которое нарушает соединение с сервером. Отключайте расширения по очереди, чтобы найти то, которое выдает ошибку.
  3. Проверьте подключение к интернету. Низкая скорость интернета или перебои при подключении может повлиять на время получения ответа сервера. Из-за этого и появляется ошибка 522.


Как проверить подключение к интернету

  1. 1.

    Откройте командную строку. Для этого введите в поисковую строку «Командная строка» и выберите появившееся приложение:

  2. 2.

    Введите в командной строке:

Готово, вы получите сообщение с количеством переданных и полученных пакетов. Если потерянных пакетов нет, значит, у вас хорошее соединение с интернетом и проблема в другом. Если потерянные пакеты есть, свяжитесь с интернет-провайдером, чтобы улучшить интернет-соединение.

4. Очистите кеш DNS. Проблемы с соединением могут возникнуть из-за несоответствия IP-адреса сервера сайта в кэше компьютера с реальным адресом. Такое происходит, когда владельцы сайтов по какой-либо причине меняют IP-адреса сервера. Чтобы устранить эту проблему, воспользуйтесь инструкцией.

Ошибка 524 A timeout occurred

Ошибка 524 возникает, когда подключение с веб-сервером установлено, но он не ответил за установленное время ожидания соединения:

Время ожидания HTTP-ответа на CloudFlare — 100 секунд. Если веб-сервер не предоставил ответ, система выдаст 524 ошибку.

Основные причины:

  • длительная работа PHP-процесса или запроса к базе данных;
  • веб-сервер перегружен. Проверьте доступные ресурсы сервера, в том числе процессор и оперативную память.

Если вы регулярно выполняете тяжёлые запросы, которые могут занять больше 100 секунд, переместите эти процессы на субдомен, который не проксимируется в Cloudflare.

Рекомендации по исправлению ошибки 524 даны в справке CloudFlare.

Техническая поддержка

Специалисты REG.RU не оказывают техническую поддержку по сервису CloudFlare. Для устранения ошибки обратитесь в техническую поддержку CloudFlare. Если некорректная работа сайта связана с хостингом REG.RU, напишите заявку в службу технической поддержки.

Ошибки 520-524 требуют много знаний о сервере и его работе, поэтому самый верный способ решить проблему ― обратиться к хостинг-провайдеру, администратору сайта или к технической поддержке CloudFlare (если проблема на стороне их сервиса).

Источник

How to fix Cloudflare’s ‘524 A Timeout Occurred’ Error

The 524 A Timeout Occurred error is a Cloudflare-specific HTTP status code that indicates that the connection to the server has been closed due to a timeout.

Depending on the context, the error might prevent you from loading a web page, signing in to an online gaming platform, or using a piece of software.

Or, the game or application might work fine when you’re using it offline, and 524 A Timeout Occurred might show up only when you try accessing an online feature.

These errors are almost always displayed on two lines like this: 

Error 524
A timeout occurred

Error 524 messages can be seen on any device running any operating system.

Error 524 Causes

These error messages are seen in situations involving Cloudflare. The error means Cloudflare established a connection to the server it’s supposed to communicate with, but the server took too long to respond.

If you see this error while trying to access a website or a certain feature in an app, there’s little you can do as the visitor except notify the owner of the service or app. There are exceptions to this, however, as you’ll see below.

On the other hand, if you’re the owner of a website that’s receiving the 524 A Timeout Occurred error, there are a few things you can try to fix it.

How to Fix the 524 A Timeout Occurred Error

If you’re the website owner, skip down to the next set of steps below. Otherwise, here are some tips to try:

  1. Refresh the web page if you see the error in your browser, or shut down and restart the program if it’s seen there. This could be a temporary problem that a simple restart will fix.

  2. Completely uninstall the program and then reinstall it again by downloading the most recent version from the company’s website or installation disc.

    Some users have reported that this fixed their 524 error since it reestablished a connection to the server, but this method is probably only helpful if the error occurs in a non-browser program, like an application that connects to a gaming server.

  3. If you get the error when using the Origin gaming platform, it could be related to restrictions built-in to your account. Child accounts are restricted; they don’t let you play online, communicate with friends, download games from the Origin store, and more.

    If this is the reason you’re seeing the error code 524, you have to log in to the child account to upgrade it to a full/adult account. But apart from changing the date of birth of the account holder, this is only possible once you’re no longer considered underage. You’ll be notified when the child account is eligible for an upgrade.

  4. Depending on the popularity of the website or service, the error could be due to a sudden influx of visitors that the site wasn’t expecting, which could put a strain on the server resources, resulting in this timeout error.

    Waiting it out is all you can do in this case.

Are You the Website Owner?

Follow these steps if you’re the owner of the website or if you have the proper credentials to make server-side changes.

  1. Disable all your website plugins and then repeat the action that showed the Error 524 message. If this fixes the error, enable the plugins again, one by one, until you can pinpoint which one is causing the Timeout Occurred error.

  2. An increased server load due to a DDoS attack may be the cause of the 524 error, in which case you could enable DDos protection through Cloudflare.

    If the error message is due to your website suddenly getting more legitimate traffic, consider upgrading your hosting plan to accommodate the extra resources needed to serve that number of visitors.

  3. Move any long-running processes to a subdomain not proxied in the Cloudflare DNS app. Any HTTP request that doesn’t receive a response from the origin server for over 100 seconds (or over 600 seconds for enterprise customers) will be timed out, and you’ll see the 524 A Timeout Occurred error.

  4. Some Error 524 messages are caused by something out of your control. Contact your hosting provider and give them the error code, timezone the error occurred in, and the URL that resulted in the error. They might need to check server logs and memory levels.

Thanks for letting us know!

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Источник

Ошибки 520, 521, 522, 524 могут появляться на сайте в том случае, если вы используете для своего сайта сервисы Cloudflare. Cloudflare — сервис, перенаправляющий трафик. Он позволяет увеличить скорость загрузки сайта и обеспечивает защиту от хакерских и DDoS-атак.

Ошибка 520 (Web server is returning an unknown error)

Если Cloudflare не удается обработать ответ сервера, на котором размещен сайт, то он выдает эту ошибку.

Причины появления ошибки 520

  1. Разрыв соединения, когда запрос к серверу был успешным.
  2. Превышение размера заголовка запроса (больше 8 КБ).
  3. Ответ сервера не содержит информацию.
  4. Ответ сервера некорректен.

Способы устранения ошибки 520 Web server is returning an unknown error

Если любое из вышеперечисленных условий исходит от веб-сервера, на котором размещен сайт, нужно обратиться в техподдержку хостинг-провайдера.

Правила ограничения скорости Cloudflare или другие запросы фильтрации иногда могут вызывать проблемы в работе сайта. Важно проверить и протестировать ваш сайт после подключения сервисов Cloudflare. Если на сервере хостинга используются системы безопасности, блокирующие запросы к сайту, обязательно укажите IP-адреса Cloudflare в белом списке, чтобы исключить вероятность блокировки запросов.

Список диапазонов IP-адресов Cloudflare

Ошибка 521 (Web Server Is Down)

Браузер показывает ошибку 521, когда веб-сервер неожиданно обрывает соединение с Cloudflare.

Причины появления ошибки 521

  1. Невозможно получить ответ от сервера.
  2. Система безопасности веб-сервера внесла запросы Cloudflare в черный список. Это связано с тем, что система работает по принципу обратного прокси-сервера. Ваша система безопасности могла принять периодические подключения от статических IP-адресов за DDoS-атаку. Из-за этого адреса блокируются или ограничиваются по скорости.

Способы устранения ошибки 521 Web Server Is Down

Возможно, веб-сервер отключен или работает с перебоями. В таком случае:

  1. Убедитесь, что ваш веб-сервер работает нормально.
  2. Просмотрите журналы ошибок сервера, чтобы выявить причину ошибки.

Если веб-сервер или хостинг-провайдер блокируют запросы Cloudflare, внесите в белый список все диапазоны IP-адресов сервиса в брандмауэре сервера или другом программном обеспечении безопасности.

Ошибка 522 (Connection timed out)

Появляется в случае, когда превышено время ожидания ответа от веб-сервера.

Причины появления ошибки 522

  1. Веб-сервер не может ответить на запрос из-за высокой загруженности.
  2. Система защиты веб-сервера блокирует запросы Cloudflare.
  3. Нет доступа к веб-серверу.

  4. Некорректно указаны настройки DNS на Cloudflare: запросы отправляются по другому адресу.

  5. Неверная настройка маршрутизации между Cloudflare и веб-сервером.

Способы устранения ошибки 522 Connection timed out

Убедитесь, что:

  1. IP-адреса Cloudflare не блокируются в брандмауэре.
  2. Ваш хостинг-провайдер не ограничивает скорость и не блокирует запросы от Cloudflare.
  3. Веб-сервер не перегружен.

Неисправную маршрутизацию в сети между Cloudflare и исходным веб-сервером устранить сложнее. Прежде чем перейти к этому пункту, исключите предыдущие. Если вы считаете, что причиной могут быть проблемы с сетью, отправьте заявку в службу поддержки Cloudflare.

Ошибка 524 (A timeout occurred)

Браузер покажет эту страницу, когда подключение к веб-серверу будет установлено, но его ответ превысит лимит ожидания. Cloudflare ожидает HTTP-ответ в течение 100 секунд.

Причины появления ошибки 524

  1. Проблемы в работе PHP-скриптов или сбой базы данных.
  2. Высокая загруженность веб-сервера.

Способы устранения ошибки 524 A timeout occurred

Проверьте доступные ресурсы веб-сервера, включая процессор, оперативную память и общий уровень трафика. Высокий уровень использования памяти память или высокая загрузка процессора могут сигнализировать о проблеме с ресурсами.

Если вы регулярно отправляете HTTP-запросы, выполнение которых занимает более 100 секунд (например, экспорт больших данных), рассмотрите возможность перемещения этих длительных процессов в поддомен, который не проксируется Cloudflare.

Служба поддержки RU-CENTER не оказывает техническую поддержку по сервису Cloudflare. Для устранения ошибок, пожалуйста, обратитесь в техническую поддержку Cloudflare. Если неполадки в работе сайта связаны с хостингом RU-CENTER, пожалуйста, отправьте заявку в нашу службу технической поддержки.

  Туториал: как исправить ошибки сервера

Источник

When Cloudflare is able to successfully connect to a web server but it doesn’t receive any HTTP response after a while, you’ll see the pesky Error 524: A Timeout Error Occurred:

Cloudflare Error 524

Cloudflare normally creates a TCP connection to the origin server, and it waits for a timeout period of 100 seconds for the origin server to respond.

Once the connection is established, Cloudflare starts transferring data with the help of the HTTP protocol.

In a rush? Click here to get to the fixes and skip the tech mumbo-jumbo 😉

What is Cloudflare Error 524: A Timeout Error Occurred?

While an erroneous connection will throw a more detailed error code for the given problem (like error 520 or error 521), if no connection is ever established at all you’ll see Error 524: A Timeout Occurred. The 524 error usually signals some sort of server error possibly due to a misconfigured script or a web application’s processes crashing.

It Just Doesnt Connect

A timeout error can occur when servers are overpopulated and the server is struggling to keep track of all processes running at any given time.

How To Fix Cloudflare Error 524: A Timeout Occurred

  1. Refresh The Webpage
  2. Reinstall The Application
  3. Check Your Server Load
  4. Upgrade Your System
  5. Check Your Traffic On Port 80
  6. Move to a Subdomain
  7. Modify Your PHP Settings
  8. Contact Your Hosting Provider

If a user complains to you that their connection timed out it might not be your fault.

Not My Fault

First, make sure that the problem isn’t on their end.

1. Refresh The Webpage

Try refreshing the page. If that doesn’t help, close the browser and reload it. Sometimes a simple restart is all that’s needed to solve whatever is causing the problem.

If this doesn’t help, try clearing the cache & cookies before moving on to another step.

Restarting the browser won’t do this automatically, and sometimes a corrupted cache entry or cookie is all that’s interrupting your page from loading.

2. Reinstall The Application

If you’re experiencing an error with an application or a game, try re-installing it.

You can also contact your hosting provider to make sure that the server is not compromised.

If you get everything is working again, be sure to check your server’s traffic to see if other users may be experiencing the same problem.

Once you’re confident that the user’s computer isn’t the main issue, take the following steps to troubleshoot your Cloudflare web server.

3. Check Your Server Load

The most common cause of Error 524: A Timeout Occurred is excessive server load.

Server Overload

You can easily check how busy your origin server using the Cloudflare CLI is by running this command:

top -c

You’ll see the different processes running on your web server.

Look for resource-intensive tasks that are demanding high CPU and bandwidth usage.

For example, if there are too many PHP applications running too many procedures simultaneously, terminate them all.

Even though this may momentarily interrupt end-user activity it will kick open your server to accept traffic again.

MySQL processes can be an offender when too many sleep connections start stacking up.

There’s an easy command in the MySQL command prompt you can use to check for this:

show full processlist;

If you take these steps and manage to clear the 524 error then you’re on the right track. But these fixes are only a temporary stopgap.

If too many processes cluttered up your server once, it can happen again. Keep troubleshooting to get to the heart of the problem.

4. Upgrade Your System

If Error 524: A Timeout Occurred is triggered on your server it’s recommended that you check to see whether the hardware of your server is holding up.

This error can occur due to the overconsumption of hardware resources like your memory and CPU.

Simple as it may sound and frustrating as it may be, error code 524 may be a tip that it’s time to upgrade your web server hardware.

With modern equipment, you shouldn’t have trouble keeping your loading times under 100 seconds to avoid the Cloudflare error.

5. Check Your Traffic On Port 80

Under normal circumstances, your website should be able to handle traffic spikes. But error 524 means you’re facing abnormal traffic.

Traffic

Anything from a faulty script to a DDoS attack could be overloading your server with HTTP requests. You can check IP address requests to your site using this server command:

netstat -an | grep 80

If you detect suspicious IP addresses spamming your server, you can block them using the command:

iptables -A INPUT -s ###.##.##.### -j DROP

And don’t forget to restart Apache:

systemctl httpd restart

It’s a good idea to regularly check on your HTTP traffic to ensure you’re not being spammed and that your web server bandwidth supports your site’s traffic as it grows.

Depending on your hosting provider, you may also be able to set up automated alerts to inform you about long-running activity spikes or suspicious connections.

6. Move to a Subdomain

If you’re not experiencing a DDoS attack or another type of external service interruption, and you’ve managed to identify a culprit, you can circumvent Error 524: A Timeout Occurred by moving the processes to a subdomain.

You can configure subdomains outside of your Cloudflare DNS app.

These “grey clouded” domains can run the processes in the background and send updates to the server without keeping the HTTP connection open.

This allows your Cloudflare to handle its incoming traffic requests while your web server handles cumbersome processes separately.

Contact your hosting provider for service-specific instructions on configuring a subdomain for your site.

7. Modify Your PHP Settings

If your web server is configured to run PHP scripts, you can set the max_execution_time variable in your php.ini file to the number of seconds you want.

For long-running scripts, a common practice is to extend load times to 2 minutes.

120 seconds is a slight increase from the default 100 seconds and is often enough extra time to allow PHP scripts to execute before triggering the 524 error.

8. Contact Your Hosting Provider

If you’ve exhausted all of the steps above and you’re still stuck, it’s time to contact your host.

Call For Help

Error 524 can appear for reasons beyond your control if there’s a problem at your host’s data center.

Let them know the error code, the time zone where the problem occurred, and the URL that threw the error.

This helps them identify and solve the issue as soon as possible.

If you’re looking for (free) tips to optimize your site speed with Cloudflare and rank higher on Google,
you can follow me on Twitter 👉🏻 @bitofseo.

Please DM me if you have any questions about this Cloudflare article (or have some feedback to make it better 😄️).

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Содержание

  1. Ошибки 520, 521, 522, 524 на сайте
  2. Ошибка 520 Unknown Error
  3. Ошибка 521 Web Server Is Down
  4. Ошибка 522 Connection timed out
  5. Как исправить ошибку 522 в Google Chrome
  6. На сайте ошибки 520, 521, 522, 524
  7. Unknown Error — ошибка 520
  8. Web Server Is Down — ошибка 521
  9. Connection timed out — ошибка 522
  10. A timeout occurred — Ошибка 524
  11. Error 524: A Timeout Occurred (What It Is & How to Fix It)
  12. Error 524 Causes
  13. How to Fix the 524 A Timeout Occurred Error
  14. Are You the Website Owner?
  15. Ошибки 520, 521, 522, 524
  16. Ошибка 520 (Web server is returning an unknown error)
  17. Ошибка 521 (Web Server Is Down)
  18. Ошибка 522 (Connection timed out)
  19. Ошибка 524 (A timeout occurred)
  20. Туториал: как исправить ошибки сервера

Ошибки 520, 521, 522, 524 на сайте

Ошибки 520, 521, 522, 524 связаны с проблемами в работе сервиса CloudFlare.

CloudFlare — сервис для перенаправления трафика на сайт с помощью облачного прокси-сервера, который обеспечивает дополнительную защиту от DDoS-атак и ускоряет загрузку вашего сайта.

Ошибка 520 Unknown Error

Что означает ошибка 520? Система CloudFlare выдаёт 520 ошибку, если не может обработать ответ от веб-сервера, на котором расположен сайт:

Причины появления ошибки:

  • сброс соединения (после успешного запроса сервер разорвал соединение);
  • заголовок запроса превышает ограничение размера заголовка Cloudflare (более 8 КБ). Если у вас много файлов cookie или они очень большие, это может привести к увеличению размера заголовков. Так как у Cloudflare есть ограничение на размер заголовка в 8 КБ, он не может обработать длинный заголовок;
  • пустой ответ от сервера. Это происходит, когда DNS домена указывают на неправильный сервер.
  • некорректный ответ от сервера;
  • система безопасности блокирует запросы. Укажите IP-адреса Cloudflare в белом списке, чтобы система не блокировала запросы.

Способы устранения ошибки:

  1. Отключить CloudFlare. Так вы сможете понять, где находится ошибка (на сервере или в CloudFlare).
  2. Удалить плагины. Для плагинов иногда требуется много файлов cookies. Если на сайте много плагинов, это может повлиять на размер заголовков. Они могут быть слишком большими по размеру, и Cloudflare не справится с ними. Чтобы исправить ошибку, отключите плагины один за другим. Если ошибка пропадёт, удалите некоторые из плагинов.
  3. Проверьте настройки DNS в CloudFlare. Убедитесь, что запись A указывает на правильный IP-адрес.

Подробные рекомендации по исправлению ошибки 520 даны в справке CloudFlare.

Ошибка 521 Web Server Is Down

Код ошибки 521 возникает, когда веб-сервер обрывает соединение с CloudFlare:

Это может произойти в двух случаях:

  • сервер не отвечает или недоступен. Необходимо проверить работоспособность сервера;
  • веб-сервер блокирует запросы CloudFlare. Поскольку CloudFlare работает как обратный прокси-сервер, все запросы к серверам поступают от IP-адресов CloudFlare. Иногда система безопасности хостинга принимает постоянные подключения с одних и тех же IP-адресов за DDoS-атаку. В результате на IP-адреса CloudFlare накладывается блокировка/ограничения по скорости.

Диапазон IP-адресов CloudFlare вы можете увидеть по ссылке.

Рекомендации по исправлению ошибки 521 даны в справке CloudFlare.

Ошибка 522 Connection timed out

Ошибка 522 возникает, если превышено время ожидания ответа от веб-сервера и пользователь не может попасть на страницу:

  • веб-сервер перегружен и не ответил на запрос,
  • на веб-сервере стоит система защиты, которая блокирует запросы от CloudFlare,
  • веб-сервер недоступен,
  • некорректный IP-адрес, установленный в настройках DNS на CloudFlare (Запрос от CloudFlare был отправлен на другой IP),
  • проблемы с маршрутизацией сети между CloudFlare и веб-сервером.

Что делать? Для решения проблемы удостоверьтесь, что ваш веб-сервер активен и принимает HTTP-запросы. Проверьте, корректны ли настройки DNS в Личном кабинете на CloudFlare.

Подробные рекомендации по исправлению ошибки 522 даны в справке CloudFlare.

Как исправить ошибку 522 в Google Chrome

  1. Очистите кеш браузера. Браузер может быть переполнен данными о посещении сайтов. Освободите место в кэше браузера по инструкции.
  2. Удалите расширение браузера, которое нарушает соединение с сервером. Отключайте расширения по очереди, чтобы найти то, которое выдает ошибку.
  3. Проверьте подключение к интернету. Низкая скорость интернета или перебои при подключении может повлиять на время получения ответа сервера. Из-за этого и появляется ошибка 522.

Откройте командную строку. Для этого введите в поисковую строку «Командная строка» и выберите появившееся приложение:

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На сайте ошибки 520, 521, 522, 524

520, 521, 522, 524 — это нестандартные типы ошибок, которые можно встретить при использовании сервиса CloudFlare. CloudFlare — сервис, с помощью которого можно перенаправить трафик на сайт, ускорить загрузку его страниц и настроить дополнительную защиту от DDoS-атак. Cloudflare работает как обратный прокси-сервер для сайта.

Unknown Error — ошибка 520

Если CloudFlare не может обработать ответ от веб-сервера, на котором расположен сайт, вы увидите ошибку 520:

Возможные причины ошибки:

  • сервер дает некорректный ответ;
  • приходит пустой ответ от сервера;
  • сервер разорвал соединение после успешного запроса;
  • заголовок запроса превышает ограничение размера (более 8 КБ).

Исправить ошибку 520 можно с помощью инструкций в справке CloudFlare.

Web Server Is Down — ошибка 521

Если между веб-сервером и CloudFlare оборвалось соединение, вы увидите ошибку 521:

Основные причины ошибки:

  • сервер недоступен или не отвечает — проверьте работоспособность сервера;
  • веб-сервер блокирует все запросы. Поскольку CloudFlare работает по принципу обратного прокси-сервера, все запросы приходят от IP-адресов системы. Система безопасности принимает регулярные подключения с одинаковых адресов IP за DDoS-атаку. Из-за этого накладываются ограничения по скорости.

На официальном сайте можно увидеть диапазон IP-адресов CloudFlare. Ошибку 521 можно исправить с помощью инструкций в справке CloudFlare.

Connection timed out — ошибка 522

Если время ожидания ответа от веб-сервера превышено, вы увидите ошибку 522:

Ошибка может возникнуть, если:

  • веб-сервер недоступен;
  • веб-сервер перегружен и не отвечает;
  • запросы от CloudFlare блокирует система защиты веб-сервера;
  • некорректные настройки маршрутизации между веб-сервером и CloudFlare;
  • в настройках DNS на CloudFlare установлен некорректный IP-адрес.

Перед решением проблемы убедитесь, что ваш веб-сервер принимает HTTP-запросы. Также проверьте, что DNS в Личном кабинете на CloudFlare настроены корректно. Ошибку 522 можно исправить с помощью инструкций в справке CloudFlare.

A timeout occurred — Ошибка 524

В случае когда подключение с веб-сервером установлено, но он не успел ответить за установленное время ожидания, может возникнуть ошибка 524. Время ожидания HTTP-ответа на CloudFlare — 100 секунд.

Основные причины ошибки:

  • перегружен веб-сервер (проверьте процессор, оперативную память и другие ресурсы сервера);
  • задержка запроса к базам данных или PHP-процесса.

Ошибку 522 можно исправить с помощью инструкций в справке CloudFlare.

Обратите внимание!

Специалисты 2domains не оказывают техническую поддержку по сервису CloudFlare. По вопросам возникновения ошибок обращайтесь в техническую поддержку CloudFlare. Если некорректная работа сайта связана с хостингом 2domains, оставьте заявку в клиентскую службу.

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Error 524: A Timeout Occurred (What It Is & How to Fix It)

The 524 A Timeout Occurred error is a Cloudflare-specific HTTP status code that indicates that the connection to the server has been closed due to a timeout.

Depending on the context, an Error 524 message might prevent you from loading a web page, signing in to an online gaming platform, or using a piece of software.

Or, the game or application might work fine when you’re using it offline, and 524 A Timeout Occurred might show up only when you try accessing an online feature.

524 A Timeout Occurred errors are almost always displayed on two lines like this:

Error 524 Causes

Error 524 messages are seen in situations involving Cloudflare. The error means that Cloudflare established a connection to the server it’s supposed to communicate with, but the server took too long to respond.

If you see this error while trying to access a website or a certain feature in an app, there’s little you can do as the visitor except notify the owner of the service or app. There are exceptions to this, however, as you’ll see below.

On the other hand, if you’re the owner of a website that’s receiving the 524 A Timeout Occurred error, there are a few things you can try to fix it.

How to Fix the 524 A Timeout Occurred Error

  1. Refresh the web page if you see the error in your browser, or shut down and restart the program if the Error 524 is seen there. This could be a temporary problem that a simple restart will fix.
  2. Completely uninstall the program and then reinstall it again by downloading the most recent version from the company’s website or installation disc.
  3. Some users have reported that this fixed their 524 error since it reestablished a connection to the server, but this method is probably only helpful if the 524 error occurs in a non-browser program, like an application that connects to a gaming server.
  4. If you get the error when using the Origin gaming platform, it could be related to restrictions built-in to your account. Child accounts are restricted; they don’t let you play online, communicate with friends, download games from the Origin store, and more.
  5. If this is the reason you’re seeing the error code 524, you have to log in to the child account to upgrade it to a full/adult account. But apart from changing the date of birth of the account holder, this is only possible once you’re no longer considered underage. You’ll be notified when the child account is eligible for an upgrade.
  6. Depending on the popularity of the website or service, the 524 error could be due to a sudden influx of visitors that the site wasn’t expecting, which could put a strain on the server resources, resulting in this timeout error.

Waiting it out is all you can do in this case.

Are You the Website Owner?

Follow these steps if you’re the owner of the website or if you have the proper credentials to make server-side changes.

  1. Disable all your website plugins and then repeat the action that showed the Error 524 message. If this fixes the error, enable the plugins again, one by one, until you can pinpoint which one is causing the 524 A Timeout Occurred error.
  2. An increased server load due to a DDoS attack may be the cause of the 524 error, in which case you could enable DDos protection through Cloudflare.
  3. If the Error 524 message is due to your website suddenly getting more legitimate traffic, consider upgrading your hosting plan to accommodate the extra resources needed to serve that number of visitors.
  4. Move any long-running processes to a subdomain not proxied (gray clouded) in the Cloudflare DNS app. Any HTTP request that doesn’t receive a response from the origin server for over 100 seconds (or over 600 seconds for enterprise customers) will be timed out and you’ll see the 524 A Timeout Occurred error.
  5. Some Error 524 messages are caused by something out of your control. Contact your hosting provider and give them the error code, timezone the 524 error occurred in, and the URL that resulted in the error. They might need to check server logs and memory levels.

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Ошибки 520, 521, 522, 524

Ошибки 520, 521, 522, 524 могут появляться на сайте в том случае, если вы используете для своего сайта сервисы Cloudflare. Cloudflare — сервис, перенаправляющий трафик. Он позволяет увеличить скорость загрузки сайта и обеспечивает защиту от хакерских и DDoS-атак.

Ошибка 520 (Web server is returning an unknown error)

Если Cloudflare не удается обработать ответ сервера, на котором размещен сайт, то он выдает эту ошибку.

Причины появления ошибки 520

  1. Разрыв соединения, когда запрос к серверу был успешным.
  2. Превышение размера заголовка запроса (больше 8 КБ).
  3. Ответ сервера не содержит информацию.
  4. Ответ сервера некорректен.

Способы устранения ошибки 520 Web server is returning an unknown error

Если любое из вышеперечисленных условий исходит от веб-сервера, на котором размещен сайт, нужно обратиться в техподдержку хостинг-провайдера.

Правила ограничения скорости Cloudflare или другие запросы фильтрации иногда могут вызывать проблемы в работе сайта. Важно проверить и протестировать ваш сайт после подключения сервисов Cloudflare. Если на сервере хостинга используются системы безопасности, блокирующие запросы к сайту, обязательно укажите IP-адреса Cloudflare в белом списке, чтобы исключить вероятность блокировки запросов.

Ошибка 521 (Web Server Is Down)

Браузер показывает ошибку 521, когда веб-сервер неожиданно обрывает соединение с Cloudflare.

Причины появления ошибки 521

  1. Невозможно получить ответ от сервера.
  2. Система безопасности веб-сервера внесла запросы Cloudflare в черный список. Это связано с тем, что система работает по принципу обратного прокси-сервера. Ваша система безопасности могла принять периодические подключения от статических IP-адресов за DDoS-атаку. Из-за этого адреса блокируются или ограничиваются по скорости.

Способы устранения ошибки 521 Web Server Is Down

Возможно, веб-сервер отключен или работает с перебоями. В таком случае:

  1. Убедитесь, что ваш веб-сервер работает нормально.
  2. Просмотрите журналы ошибок сервера, чтобы выявить причину ошибки.

Если веб-сервер или хостинг-провайдер блокируют запросы Cloudflare, внесите в белый список все диапазоны IP-адресов сервиса в брандмауэре сервера или другом программном обеспечении безопасности.

Ошибка 522 (Connection timed out)

Появляется в случае, когда превышено время ожидания ответа от веб-сервера.

Причины появления ошибки 522

  1. Веб-сервер не может ответить на запрос из-за высокой загруженности.
  2. Система защиты веб-сервера блокирует запросы Cloudflare.
  3. Нет доступа к веб-серверу.
  1. IP-адреса Cloudflare не блокируются в брандмауэре.
  2. Ваш хостинг-провайдер не ограничивает скорость и не блокирует запросы от Cloudflare.
  3. Веб-сервер не перегружен.

Неисправную маршрутизацию в сети между Cloudflare и исходным веб-сервером устранить сложнее. Прежде чем перейти к этому пункту, исключите предыдущие. Если вы считаете, что причиной могут быть проблемы с сетью, отправьте заявку в службу поддержки Cloudflare.

Ошибка 524 (A timeout occurred)

Браузер покажет эту страницу, когда подключение к веб-серверу будет установлено, но его ответ превысит лимит ожидания. Cloudflare ожидает HTTP-ответ в течение 100 секунд.

Причины появления ошибки 524

  1. Проблемы в работе PHP-скриптов или сбой базы данных.
  2. Высокая загруженность веб-сервера.

Способы устранения ошибки 524 A timeout occurred

Проверьте доступные ресурсы веб-сервера, включая процессор, оперативную память и общий уровень трафика. Высокий уровень использования памяти память или высокая загрузка процессора могут сигнализировать о проблеме с ресурсами.

Если вы регулярно отправляете HTTP-запросы, выполнение которых занимает более 100 секунд (например, экспорт больших данных), рассмотрите возможность перемещения этих длительных процессов в поддомен, который не проксируется Cloudflare.

Туториал: как исправить ошибки сервера

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