Как исправить ошибку java net connectexception connection refused no further information

Java.net.ConnectException: Connection timed out: no further information — Решение

При попытке подключения к серверу «Майнкрафт» пользователь может столкнуться с сообщением «Java.net.ConnectException: Connection timed out: no further information». Появление данного сообщения обычно сигнализирует о возникновении различного рода сетевых проблем при получении доступа к игровому серверу, из-за чего желание пользователя насладиться игровыми мирами «Майнкрафт» остаётся нереализованным. Ниже я разберу суть данной дисфункции, опишу её причины, а также поясню, как исправить ошибку Java.net.ConnEctexception на вашем ПК.

Connection timed out: no further information – особенности дисфункции

В переводе текст данного сообщения выглядит примерно как «Сетевой сбой Java. Время соединения истекло: дальнейшая информация отсутствует».

Указанная ошибка Java.net.ConnectException обычно возникает во время подключения к серверу игры «Майнкрафт», но также фиксировались спорадические случаи появления данной ошибки при работе других продуктов, использующих «Java» (к примеру, на «Azure notification hub»).

Появление проблемы «Java.net.ConnectException: Connection timed out: no further information» имеет следующие причины:

• Пользователь использует нестабильное сетевое соединение с медленным интернетом;
• На ПК пользователя установлена устаревшая версия «Java»;
• Пользователь пользуется устаревшей версией «Майнкрафт»;
• Наблюдаются сбои в работе игрового сервера, к которому пробует подключиться пользователь (ресурс не доступен, проходят технические работы и др.);
• Антивирус или брандмауэр блокирует подключения к игровому серверу;
• Пользователь использует динамический IP;
• Пользовательский роутер работает некорректно.

Как исправить «Java.net.ConnectException: Connection timed out»

Существуют несколько способов избавиться от ошибки Java.net.ConnectException. Рассмотрим их по порядку:

• Перезагрузите ваш PC. В некоторых случаях данный простой метод позволял решить ошибку java.net.connectexception connection refused;
• Установите на ПК свежую версию «Java». Довольно частой причиной рассматриваемой проблемы является устаревшая версия «Java» на пользовательском ПК. Перейдите в Панель управления, затем в «Программы», там найдите «Java» и кликните на неё. После появления окна её настроек перейдите на вкладку «Update», нажмите там на кнопку «Update Now», и установите в системе требуемые обновления.

Данную процедуру необходимо провести как на вашей машине, так и на машине того пользователя, с которым вы собираетесь играть в «Майнкрафт» по сети;

Внесите «Майнкрафт» в исключения брандмауэра и антивируса на вашем ПК. Запустите Панель управления, перейдите в «Система и безопасность», там найдите «Брандмауэр Виндовс» и кликните на него. В открывшемся окне настроек брандмауэра слева сверху выберите опцию «Разрешения взаимодействия…».

В открывшемся окне разрешённых для внешнего подключения программ найдите программы с упоминанием «Java», и поставьте им галочки для разрешения подключения (поможет кнопка «Изменить параметры»). Нажимаем на «Ок» для сохранения результата, перезагружаемся и пробуем подключиться к серверу. С антивирусом необходимо проделать аналогичные операции, внеся «Java» и «Майнкрафт» в его исключения;

Источник

How to Fix ‘Connection refused: no further information’ Error on Minecraft

Fix: ‘io.netty.channel.AbstractChannel$AnnotatedConnectException’ Error on Minecraft

Quite recently a lot of reports have been coming in of users encountering the error “io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: no further information” while trying to connect to a server. This error is not limited to a single server and persists across all of them.

Error message “io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: no further information” while trying to connect to the server

What Causes the Connection Refused Error?

After receiving numerous reports from multiple users we investigated the issue and devised a set of solutions that solved the problem for most of the users. Also, we looked into the reasons due to which the error is triggered and listed them below. For that:

• IP issue: In some cases, the problem is caused due to the wrong IP address or the port listed while trying to connect to a server. The IP address along with the correct port is used to forward your connection to the server and connection is established once the server approves. Unless you are using a static IP address, that is quite rare, the IP address assigned to you by the ISP changes from time to time, and multiple users might be allocated the same IP address. Therefore, the IP address needs to be edited from time to time.
• Firewall: Also it is possible that the Windows Firewall that you are using might be blocking your connection to the server. Both the Java files and the game directory is to be added to the exclusion list of the Windows Firewall in order for the game to connect to the server properly.
• Outdated Java: Minecraft requires the Java software to be updated to the latest version in order for it to work properly. If the Java is outdated on your device and the launcher has been updated to the latest version it might cause conflicts with certain elements of the game and prevent proper connection to the server.
• Incompatible Software: There is a list of software that is not compatible with Minecraft and causes issues if they are installed on the computer on which you are trying to connect to the server. Minecraft has an official list of software that is not compatible with the game and causes conflicts.

Now that you have a basic understanding of the nature of the issue we will move on towards the solutions. It is recommended that you try these solutions in the specific order in which they are provided to ensure that no conflicts occur.

Power-Cycle your Network

Whenever the internet router is reset the IP address that is provided by the ISP is changed unless you are using a static IP address. Therefore, in this step, we will be reinitializing the internet settings and the DNS cache by completely power cycling the Internet Router. For that:

1. Disconnect the power from the internet router. Disconnecting Power cord
2. Wait for 5 minutes and reconnect the power.
3. When internet access is granted try to connect to the server and check to see if the issue persists.

Reset your Network Configurations

Your Windows Network configurations can also be a culprit here, as it’s possible that your Network settings are configured incorrectly. For resetting network configurations, follow the steps below:-

1. Search for the Command Prompt in the Windows Search bar then click “run as administrator”. Running Command Prompt
2. Once the Command Prompt window is opened, type the following commands one by one:-
3. Restart your computer and check to see if the issue persists.

Add Exception in Firewall

It is possible that the Windows Firewall that you are using might be blocking your connection to the server. Therefore, in this step, we will be adding an exception in the Firewall for some executables in the Minecraft folder that need internet access. For that:

1. Click on the start menu and select the Settings icon.
2. In the Settings, click on the “Updates & Security” option.
3. Select the “Windows Security” from the left pane and select the “Firewall & Network Protection” option.
4. Scroll down and select the “Allow an App through Firewall” option.
5. Click on “Change Settings” and select “Yes” on the warning prompt.
6. Select the “Allow another app” from the options and click on “Browse“
7. Navigate to the game installation directory and select the game and the launcher executable.
8. Now repeat the above process again and this time navigate to the directory where you have the Minecraftservers installed.
9. Open the “Maxwell” folder and then the “MinecraftServer” folder.
10. Now allow both the Javaexecutables located inside the folder in the same way.
11. Now repeat the process again and instead of clicking “Allow another app” after selecting the “change” option simply scroll down the list of apps available and allow all the “Java Platform SE Binary” options through both the “Private” and “Public” networks. The applications that need to be allowed through the firewall
12. Open the Minecraft launcher, try to connect to the server, and check to see if the issue persists. Allowing an application through the firewall

Add the IP address and Port Before Connecting

If the IP address that you are using is not a static one, it will change every couple of days or whenever the Internet Connection is reset. Therefore, in this step, we are going to be checking the IP address and the correct port for the game and add it to the Minecraft Launcher. For that:

1. Click on the search bar on the Windows toolbar and type in “Command Prompt“.
2. Right–click on the icon and select “Runas Administrator“. Right-clicking on the Command Prompt icon and selecting Run as Administrator
3. Type in “ipconfig” and note down the “IPV4Address“. Typing in ipconfig in the command prompt
4. Also, Navigate to the “Minecraft Servers folder>Maxwell (some random numbers)> MinecraftServer” and open the “Server Properties” text document. Opening the “Server Properties” text document and noting down the server port
5. Note down the “Server Port” listed there. In our case it was “25565” it should be similar in most cases however in some it is not.
6. Now open up Minecraft and navigate to the “Play Multiplayer” option.
7. Select the server which you want to join by clicking on it and select “Edit” from the below options. Clicking on the server and selecting “Edit”
8. The server name can be according to your preference but the “Address” needs to be the IPV4 address that we noted and the port number for example “XXX.XXX.X.X:25565” the “25565” is the port number and it may vary. Editing the Server Address and clicking on Done
9. Click on “Done“, click on “Refresh” and check to see if the issue persists.

Note: There are some applications that are generally incompatible with certain elements of Minecraft and cause issues with it. The list of applications is available here. If these are installed on the computer on which the server is running from or on your computer you will continue to face issues with the game.

Check for Port Filtering

We came across numerous instances where users were accidentally filtering ports. Even though the port forwarding was working alright, the filtering automatically nullifies it and you will not be able to connect to Minecraft servers.

Here, what you can do is check your router’s and your local machine’s network configurations and make sure that port filtering isn’t turned on and if it is, the correct ports are being filtered.

Check ISP Network Access

If none of the above methods work, you should check your ISP’s network access. ISPs sometimes block network access to specific domains and don’t allow you to go through. Contact your ISP and verify that internet access isn’t indeed blocked.

Furthermore, you can also change your internet connection to your smartphone’s 3G and see how that works out for you. If it does, it probably means that your ISP is blocking you and you need to change your network.

If Minecraft is working with the Mobile Data it means that your ISP is blocking the connection. If that’s the case please contact your ISP to get your issue resolved.

Источник

Перейти к содержанию

java.net.ConnectException: Connection refused is a common exception if you are dealing with network operations in Java. This error indicates that you are trying to connect to a remote address and connection is refused remotely. It’s possible if there is no remote process/service listening at the specified address or port.

You might see one of the following error lines in your stack trace when you get Connection refused exception.

  java.net.ConnectException: Connection refused: connect
  at java.net.DualStackPlainSocketImpl.connect0(Native Method)
  at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:69)
  at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:337)
  at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:198)
  at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:180)
  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:157)
  at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391)
  at java.net.Socket.connect(Socket.java:579)
  at java.net.Socket.connect(Socket.java:528)

  java.net.ConnectException: Connection refused: connect
  at java.net.PlainSocketImpl.socketConnect(Native Method)
  at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
  at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
  at java.net.Socket.connect(Socket.java:520)
  at java.net.Socket.connect(Socket.java:470)

java.net.ConnectException: Connection refused exception clearly indicates that the program you are executing is trying to connect to server side but a successful connection cannot be established.

Possible Causes of java.net.ConnectException: Connection refused

1. Client is trying to connect wrong IP or port: This is a common reason when you get ConnectException. Sometimes applications running on the server side allocate different ports each time they are started. You can either configure the application on the server side, so that it uses fixed port, or you can change the client application, so that it connects to correct port.

2. Server is not running: This is also a possible reason for java.net.ConnectException.
You should check whether the server is open or not. It might be a database server, an application server or a custom server you have implemented. If you try to open a socket connection to a closed server, you will get a connection exception.

3. Server is open but it is not listening connections: This might be the case, for instance, when application server is up and running but an installed application is not started correctly. You should check admin console of your server to check the status of applications on the server. Sometimes application is started correctly but it isn’t listening the port, you are trying to connect.

4. Firewall is blocking connections to remote host: Firewall might be the problem if you cannot connect to server side. If a firewall is blocking connections to server, client application cannot open connection on the specified IP and port.

1. Check IP address and port: First step to resolve java.net.ConnectException is checking IP address and port. If IP address and port are correct, then you should follow the other steps below.

2. Ping the server IP address: You can use ping tool to test whether you can connect to server or not.

A successful ping response is as follows:

C:>ping 192.168.1.1

Pinging 192.168.1.1 with 32 bytes of data:
Reply from 192.168.1.1: bytes=32 time=1ms TTL=64
Reply from 192.168.1.1: bytes=32 time=1ms TTL=64
Reply from 192.168.1.1: bytes=32 time=1ms TTL=64
Reply from 192.168.1.1: bytes=32 time=1ms TTL=64

Ping statistics for 192.168.1.1:
     Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
     Minimum = 1ms, Maximum = 1ms, Average = 1ms

Ping response for an unsuccessful connection is as follows:

C:>ping 192.168.1.23

Pinging 192.168.1.23 with 32 bytes of data:
Reply from 192.168.1.23: Destination host unreachable.
Reply from 192.168.1.23: Destination host unreachable.
Reply from 192.168.1.23: Destination host unreachable.
Reply from 192.168.1.23: Destination host unreachable.

Ping statistics for 192.168.1.23:
     Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

3. Try connecting the server with Telnet: You can use telnet application to simulate connection to the server. To use telnet type telnet {Server IP address} {Server port} on the command prompt. If telnet responds “Could not open connection to the host”, then you should investigate further for problems. Maybe, server is not running, or there might be a firewall issue.

C:>telnet 127.0.0.1 8080
Connecting To 127.0.0.1...Could not open connection to the host, on port 8080: Connect failed

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The simplest remedy is to figure out what is causing java.net.ConnectException: Connection refused. What is most significant in this case is the approach taken in determining the correct cause and solution. Here are some suggestions that may assist you in determining the root cause.

• First, ping the destination host; if the host is ping-able, this indicates that both the client and server machines are connected to the network.
• Use telnet to establish a connection to the server’s host and port. Inability to connect indicates that there is a problem with your client software code. Additionally, by examining the telnet output, you will be able to determine whether the server is functioning or not, as well as whether the server is severing the connection from the client.

Reasons For The Error: java.net.ConnectException: Connection refused

Connection rejected is a clear example of a client attempting to establish a connection on a TCP port but failing. Here are some of the possible causes of the error that could be encountered:

Reason 1: Client and Server, either or both of them are not in the network.

The fact that client and server are not linked to a LAN, the internet, or any other network is a possibility, and in that case, Java will throw an error message.This error message is the same one we are dealing with: java.net.ConnectException: Connection refused.

Reason 2: Server is not running

The second most frequently encountered issue is that the server is not up and operating. In that scenario, you will additionally receive java.net. ConnectException: Connection refused error.

What we don’t like about it is that no matter what the reason for the issue is, it always produces the same error message.

Furthermore, you can use the following networking commands, such as ping to determine whether the server is up and running and listening on the specified port.

Reason 3: The server is running but not listening on the port, a client is trying to connect.

This is yet another typical reason for “java.net.ConnectException: Connection refused  “, in which the server is up and running but is listening on a different port than usual. It’s difficult to figure out this case unless you sit down and think about it, then you can verify the settings. If you are working on a large project with a hierarchical configuration file, it is possible that either the default configuration or or another setting is taking precedence over your current configuration.

Reason 4: Firewall is not permitted for host-port combination

Firewalls are used to secure almost every corporate network today. It is necessary to raise firewall requests from both sides when connecting to another company’s network, for example, when starting a FIX session to the broker in an Electronic Trading System, in order to verify that the IP address and port number of the other company’s network are permitted. If the firewall is not allowing the connection,  you will also receive the same java.net.ConnectException: Connection refused exception in Java application.

Reason 5: Host Port combination is incorrect.

This could be yet another explanation for the existence of java.net.Connection refused.  You should consider the possibility that either you are supplying an invalid host port combination or that a previously used host port combination has been modified on the server’s end. Check for the most recent configuration on both the client and server sides to avoid connection denied exceptions from occurring.

Reason 6: Incorrect protocol in Connection String

TCP is the underlying protocol for several high-level protocols, including HTTP, RMI, and others. TCP is a transmission control protocol. Ensure that you are giving the correct connection string to the server, which begins with the protocol that the server expects, for example, if the server has exposed its service via RMI, the connection string should begin with rmi:/

How to fix java.lang.OutOfMemoryError: Java heap space?

An easy technique to resolve OutOfMemoryError in Java is to increase the maximum heap size using JVM options “-Xmx512M”, which will resolve your OutOfMemoryError quickly.

Alternative Method:

The second method to resolve OutOfMemoryError in Java is more difficult and occurs when you don’t have much memory and even after increasing the maximum heap size you still get java.lang.OutOfMemoryError; in this situation, you should definitely profile your programme and look for any memory leak.

You may also check your heap dump with Eclipse Memory Analyzer or any profiler such as Netbeans or JProbe. This is a difficult solution that will take some time to investigate and detect memory leaks.

How to solve java.lang.OutOfMemoryError: PermGen space?

As stated in the above paragraph, the OutOfMemory issue in Java occurs when the heap’s Permanent generation is depleted. To resolve this OutOfMemoryError in Java, use the JVM option “-XX: MaxPermSize” to raise the heap size of the Perm area.

You can also provide the initial size of Perm Space with “-XX: PermSize,” and by retaining both the initial and maximum Perm Space, you can avoid certain entire garbage collection that may occur when Perm Space is resized.

java.lang.OutOfMemoryError in Java can be tricky at times, and in those circumstances, profiling is the best answer. While you have the option to increase heap size in Java, it is advised that you follow memory management techniques while coding and add null to any unnecessary references.

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