The remote server returned an error 550 file unavailable

public string[] ReadBOMFileList()
{
    string[] mydownloadFiles;
    StringBuilder myresult = new StringBuilder();
    
    StreamReader myreader = null;
    FtpWebRequest myreqFTP = null;

    try
    {
        FTPSettings.IP = "abc.com/Project/TXN_BAAN/3DS_BOM";
        FTPSettings.UserID = "abc";
        FTPSettings.Password = "abc";
        myreqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + FTPSettings.IP + "/"));
        myreqFTP.Method = WebRequestMethods.Ftp.ListDirectory;
        myreqFTP.UseBinary = true;
        myreqFTP.Credentials = new NetworkCredential(FTPSettings.UserID, FTPSettings.Password);
        FtpWebResponse response = (FtpWebResponse)myreqFTP.GetResponse();
        myreader = new StreamReader(response.GetResponseStream());
        string myline = myreader.ReadLine();
        while (myline != null)
        {
            myresult.Append(myline);
            myresult.Append("n");
            myline = myreader.ReadLine();
        }
        
        myresult.Remove(myresult.ToString().LastIndexOf('n'), 1);
        return myresult.ToString().Split('n');
    }
    catch (Exception ex)
    {
        if (myreader != null)
        {
            myreader.Close();
        }
        mydownloadFiles = null;
        return mydownloadFiles;
    }
}

private void DownloadBOMFile(string file)
{
    try
    {
        FTPSettings.IP = "abc.com/Project/TXN_BAAN";
        FTPSettings.UserID = "abc";
        FTPSettings.Password = "abc";
        string uri = "ftp://" + FTPSettings.IP + "/" + "3DS_BOM" + "/" + file;
        Uri serverUri = new Uri(uri);
        if (serverUri.Scheme != Uri.UriSchemeFtp)
        {
            return;
        }
        FtpWebRequest reqFTP;
        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + FTPSettings.IP + "/" + "3DS_BOM" + "/" + file));
        reqFTP.Credentials = new NetworkCredential(FTPSettings.UserID, FTPSettings.Password);
        reqFTP.KeepAlive = false;
        reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
        reqFTP.UseBinary = true;
        reqFTP.Proxy = null;
        reqFTP.UsePassive = false;
        FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
        Stream responseStream = response.GetResponseStream();
        if (!Directory.Exists(@"C:AdminDB3DS_BOM"))
            Directory.CreateDirectory(@"C:AdminDB3DS_BOM");
        FileStream writeStream = new FileStream(@"C:AdminDB3DS_BOM" + file, FileMode.Create);

        int Length = 2048;
        Byte[] buffer = new Byte[Length];
        int bytesRead = responseStream.Read(buffer, 0, Length);
        while (bytesRead > 0)
        {
            writeStream.Write(buffer, 0, bytesRead);
            bytesRead = responseStream.Read(buffer, 0, Length);
        }
        writeStream.Close();
        response.Close();
    }
    catch (WebException wEx)
    {
        TraceService(wEx.Message.ToString());
    }
    catch (Exception ex)
    {
        TraceService(ex.Message.ToString());
    }
}

public static class FTPSettings
{
    public static string IP { get; set; }
    public static string UserID { get; set; }
    public static string Password { get; set; }
}

string[] BOMfiles = ReadBOMFileList();
foreach (string BOMfile in BOMfiles)
{
    DownloadBOMFile(BOMfile);
}

try
{
        
}
catch(WebException e)
{
        String status = ((FtpWebResponse)e.Response).StatusDescription;
}

CodeProject,
20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8
+1 (416) 849-8900

Hi. I’m failing to upload in C# anything to the FileZilla Server. I’ve been a developer for decade, and the C# code does and will work on a Windows FTP Server, but fails with the FileZilla Server:

Basically what I am showing you is a (a) C# class, (b) that calls an “UploadFile” function by passing to it 5 parameters: (1) a Local File path, (2) a Remote File Path, (3) the FTP url, in this case an IP Address, (4) the UserName, and (5) the account Password. In this case the local file to be Uploaded is in a local directory as “C:PollofPollsPollofPollsApp_DataAdvertisementRates.xml”. The output URL on the remote server is this: “ftp://00.000.000.000//App_Data/AdvertisementRates.xml”. (This is an example. I did not use zeros. In a real test, this is the Server’s IP address.)

The function always fails in trying to establish communication with the FTP Server [ ftpStream = ftpRequest.GetRequestStream() ]. If ftpRequest.Passive is set to “true”, then the error message upon failure is “The remote server returned an error: (550) File unavailable (e.g., file not found, no access).”. If the ftpRequest.Passive is set to “false”, then the error message is “The remote server returned an error: 227 Entering Passive Mode (34,232,100,121,192,8)rn.”. The C# function which is not working with FileZila is this.

public bool UploadFile(string strLocalFile, string strRemoteFile, string strFTPHost, string strUserName, string strPassword)
{ // Output file to remote App Data directory
byte[] byteBuffer;
int intBufferSize = 2048; // Buffer size.
string strErrorMessage = «»; // Error Message upon failure.
FtpWebRequest ftpRequest = null; // FTP Request object.
Stream ftpStream = null; // FTP Stream
bool bolSuccess = true; // Assume «true» for success. If errors out, then «false» for failure.
int intWriteBytes = 0; // Bytes being written out

string strRemotePath = strFTPHost + «/» + strRemoteFile; // Becomes essentially: ftp://00.000.000.000//App_Data/AdvertisementRates.xml
System.IO.FileStream fsLocalStream;
try
{
ftpRequest = (FtpWebRequest)FtpWebRequest.Create(strRemotePath); // Create an FTP Request to ftp://00.000.000.000//App_Data/AdvertisementRates.xml
ftpRequest.Credentials = new NetworkCredential(strUserName, strPassword); // Log in to the FTP Server with the User Name and Password Provided
ftpRequest.UseBinary = true; // When in doubt, use these options
ftpRequest.UsePassive = false; // POTENTIAL ERROR: Was = true. But to keep active changed to = false for FileZilla Server.
ftpRequest.KeepAlive = true;
ftpRequest.EnableSsl = false;
ftpRequest.Method = WebRequestMethods.Ftp.UploadFile; // Specify the Type of FTP Request [ ERRORS OUT ]
ftpStream = ftpRequest.GetRequestStream(); // Establish Return Communication with the FTP Server
fsLocalStream = System.IO.File.OpenRead(strLocalFile); // Open a File Stream to Read the File for Upload, at
// C:PollofPollsPollofPollsApp_DataAdvertisementRates.xml
byteBuffer = new byte[intBufferSize]; // Buffer for the Downloaded Data
intWriteBytes = fsLocalStream.Read(byteBuffer, 0, intBufferSize); // (1) Read in first bytes of the file.
try // Upload the File by Sending the Buffered Data Until the Transfer is Complete
{
while (intWriteBytes > 0)
{
ftpStream.Write(byteBuffer, 0, intWriteBytes); // Write out bytes from the prior Read (1) or (2) if looping through the file.
intWriteBytes = fsLocalStream.Read(byteBuffer, 0, intBufferSize); // (2) Read in next string of bytes, if any still exist
}
}
catch (Exception ex) // Discover errors in the reading and writing to the Upload directory.
{
strErrorMessage = ex.Message;
bolSuccess = false;
}
fsLocalStream.Close(); // (3) Resource Cleanup
ftpStream.Close();
ftpRequest = null;
}
catch (Exception ex) // Discover Errors upon connection.
{ // If .UsePassive = false (therefore Active = true) then produced error message is this:
bolSuccess = false; // «The remote server returned an error: 227 Entering Passive Mode (34,232,100,121,192,8)rn.»
strErrorMessage = ex.Message; // If .UsePassive = true (therefore Active = false) then produced error message is this:
} // «The remote server returned an error: (550) File unavailable (e.g., file not found, no access).»
return bolSuccess; // Return Success or failure.
}

Please advise if there is any C# correction required for this function to run on FileZilla. I really need this to work.

Concerning environment, The Client is a Window 10 workstation. The failures occur with or without the Firewall on or off. The Host server is an Amazon AWS Windows Server 2012, using FileZilla Server version 0.9.44beta. Since I am new to both the FileZilla Server and Amazon AWS, there could be a setting errors. Here are the settings on AWS that I am aware of which could be affecting performance.

(1) Within the AWS Management Console, the Security Groups has within the Inbound tab, a Custom TCP Rule with the Port Range of 50000-51000 and Source set to 0.0.0.0/0.
(2) A second Custom TCP Rule is established for the Port Range of 20-21 and Source set to 0.0.0.0/0.
On the FileZilla Server, I have made the following settings:
(1) On the General Settings tap, I left the Listener on Port 21.
(2) Under “Passive Mode Settings”, I was advised to set the custom port range from 49152 to 65535.
(3) The FileZilla Server is set to the Elastic IP address of Server, which serves as the Public DNS IP address on the Passive Mode settings tab.
(4) I created within FileZilla Server a “Normal Users” group, and set up four users for my personal use.

Within the Windows Server 2012 Administrative Tools, under Windows Firewall and Advanced Security, I created two FTP Inbound Rules:
(1) The first rule following https://www.codeproject.com/Tips/404132 … -Instances was for TCP for all programs within the local port range of 49152-65535, and then for All Remote ports.
(2) The second rule for Rule was for all programs for any remote or local using Port 21, applied to Domain, Privat or Public

Please advise if there are any corrections to the AWS Server Inbound Rules, FileZila Server settings, or Windows Firewall settings that would cause my C# function to fail.

The only thing I notices as strange came from the FileZilla Client. When using the Windows Server FTP, I always set each client account in FileZilla Client to the Transfer Mode of “Default”. However, now referencing the FileZilla FTP Server from the FileZilla FTP Client, I found that every user would fail to log in. The connect would always follow the normal string of commands and events, but the Directory Listing would fail, and eventually time out. Nothing fully connected. However, when I changed the Transfer Setting to “Active” for each of the Client users, then Directory Listing for each user from the FileZilla Client succeeded and listed the contents of the server’s directory. I don’t know if that means anything, because why would something strange in performance from the FileZilla FTP Client reveal why C# programming could not connect at all UNLESS THIS strange behavior identified a problem with the FileZilla Server which presently may be affecting BOTH clients. Please advise.

Please advise if there is any C# correction required for this function to run on FileZilla. For me to use the FileZilla Server, I have to be able to connect to the FileZilla server, and be able to both upload and download to it programmatically.

Sincerely,
Pastor Burt

FTP is a simple method to upload files to the server.

Although, it is rather easy to transfer files, FTP users often get stuck with errors. One such FTP error is “550 No such file or directory“.

Broadly speaking, this error means that the file or folder do not exist.

As part of our Outsourced Technical Support Services, we regularly fix these type of FTP errors for our customers.

Today, we’ll see the causes for the error “FTP 550 no such file or directory” and how our Support Engineers fix them.

What is FTP 550 error?

Firstly, let’s get a quick idea on the FTP 550 error.

The 5xx error falls under the permanent negative completion reply status of the FTP server. And, it means that the FTP server did not accept the command and the requested action did not take place. Further more, x5x error denotes File system errors in FTP server.
Overall, the 550 error means the file was not found or there are access restrictions for the file.

Causes for “FTP 550 no such file or directory”

Recently, one of our customers reported trouble with FTP upload. The logs of his FTP session looked as shown below.

STATUS:> Transferring file "/mydir/home.html"...
COMMAND:> SIZE home.html
550 home.html: No such file.
STATUS:> Requested action not taken (e.g., file or directory not found, no access).
COMMAND:> CWD /mydir/home.html
550 /mydir/home.html: No such file or directory.

Here, the customer was trying to PUT the file home.html via FTP. And that resulted in the error.

Now, let’s see the top causes for the error.

1. Incorrect path

Usually, “FTP 550 no such file or directory” error happens when the customers try to upload files from the wrong directory.

For example, when the file is present in the folder /home/user/abc.html, an attempt to upload from the path /home will cause this error.

This error also happens when customer uses the relative path in FTP.

2. Permission problems

Similarly, wrong permission on the files or folders can also cause this 550 error. When the user do not have privileges on the file they are trying to access, it will report the 550 error.

Additionally, a typo in the file name will also lead to this error.

3. Wrong Mount points

Again, we often see FTP 550 errors when users trying to access files in the mounted file systems.

For instance, recently a customer complained about the problems accessing files via FTP. In his server, he had a mounted file system. But, this mount failed after a server reboot. And, when he tried to access a file in this mounted directory, it resulted in the error:

550 : No such file or directory

How to fix FTP 550 error?

Till now, we saw the various causes for the FTP 550 error. Let’s now have a look on how to fix it.

We already know that the underlying reason for the FTP 550 error could be file not residing at the path.

That’s why, our Support Engineers first check the exact path that the customer uses via FTP. We connect to the server via SSH and confirm the presence of the file. If the file is not found on the path, we advise customer on the correct path. Or, for file name typo issues, we educate customer on the exact file name.

We always encourage customers to use the absolute path of the file in FTP connections.

Similarly, we check the server mount points and confirm the availability of file system and its contents too.

[Are you getting 550 error while accessing files via FTP?  We can quickly fix it for you.]

Conclusion

In short, FTP error “550 no such file or directory” happens mainly when the file do not exist at the path, due to permission problems, etc. Today, we saw the top causes for the error and how our Support Engineers fix them.

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