FluentFTP: 39.0.1 regression: AutoConnect fails with Azure FTP servers

FTP OS: Windows

FTP Server: Azure

Computer OS: Windows 10

FluentFTP Version: 39.0.1

Framework: .NET 6

Using AutoConnect to connect to Azure App Service FTP servers (*.ftp.p.azurewebsites.windows.net) has started failing with 39.0.1 – times out. Guessing it’s related to the timeout changes?

Logs :

39.0.0:
# AutoConnectAsync()

# AutoDetectAsync(True, False)

# ConnectAsync()
Status:   Connecting to ***:21

# ConnectAsync()
Status:   Connecting to ***:990
Status:   FTPS Authentication Successful
Status:   Time to activate encryption: 0h 0m 0s.  Total Seconds: 0.1797745.
Response: 220 Microsoft FTP Service
Status:   Detected FTP server: WindowsServerIIS


39.0.1:
# AutoConnectAsync()

# AutoDetectAsync(True, False)

# ConnectAsync()
Status:   Connecting to ***:21

System.TimeoutException: Timed out trying to connect!
This exception was originally thrown at this call stack:
    FluentFTP.FtpSocketStream.ConnectAsync(string, int, FluentFTP.FtpIpVersion, System.Threading.CancellationToken)
    System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
    System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(System.Threading.Tasks.Task)
    System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task)
    FluentFTP.FtpClient.ConnectAsync(FluentFTP.FtpSocketStream, System.Threading.CancellationToken)
    System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
    System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(System.Threading.Tasks.Task)
    System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task)
    FluentFTP.FtpClient.ConnectAsync(System.Threading.CancellationToken)
    System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
    ...
    [Call Stack Truncated]

# Dispose()
Status:   Disposing FtpClient object...
Status:   Disposing FtpSocketStream...

About this issue

Original URL
State: closed
Created 2 years ago
Comments: 17 (11 by maintainers)

Most upvoted comments

We have a winner!

# AutoConnectAsync()

# AutoDetectAsync(True, False)

# ConnectAsync()
Status:   Connecting to ***:990
Status:   FTPS Authentication Successful
Status:   Time to activate encryption: 0h 0m 0s.  Total Seconds: 0.2446802.
Response: 220 Microsoft FTP Service
Status:   Detected FTP server: WindowsServerIIS

Thanks for your help!

IGx89 on Aug 5, 2022

Thanks! It got much further, however it appears that it’s skipping calling ConnectAsync:

# AutoConnectAsync()

# AutoDetectAsync(True, False)

# UploadBytesAsync("/site/wwwroot/somefile.json", Overwrite, False)

# FileExistsAsync("/site/wwwroot/somefile.json")

# Dispose()
Status:   Disposing FtpClient object...
Unhandled exception. FluentFTP.FtpException: Error while uploading the file to the server. See InnerException for more info.
 ---> FluentFTP.FtpException: Please call Connect() before trying to read the Capabilities!
   at FluentFTP.FtpClient.get_Capabilities() in D:\Github\FluentFTP\FluentFTP\Client\FtpClient_Properties.cs:line 545
   at FluentFTP.FtpClient.FileExistsAsync(String path, CancellationToken token) in D:\Github\FluentFTP\FluentFTP\Client\FtpClient_FileManagement.cs:line 212
   at FluentFTP.FtpClient.UploadFileInternalAsync(Stream fileData, String localPath, String remotePath, Boolean createRemoteDir, FtpRemoteExists existsMode, Boolean fileExists, Boolean fileExistsKnown, IProgress`1 progress, CancellationToken token, FtpProgress metaProgress) in D:\Github\FluentFTP\FluentFTP\Client\FtpClient_FileUpload.cs:line 993
   --- End of inner exception stack trace ---
   at FluentFTP.FtpClient.UploadFileInternalAsync(Stream fileData, String localPath, String remotePath, Boolean createRemoteDir, FtpRemoteExists existsMode, Boolean fileExists, Boolean fileExistsKnown, IProgress`1 progress, CancellationToken token, FtpProgress metaProgress) in D:\Github\FluentFTP\FluentFTP\Client\FtpClient_FileUpload.cs:line 1249
   at FluentFTP.FtpClient.UploadBytesAsync(Byte[] fileData, String remotePath, FtpRemoteExists existsMode, Boolean createRemoteDir, IProgress`1 progress, CancellationToken token) in D:\Github\FluentFTP\FluentFTP\Client\FtpClient_FileUpload.cs:line 667

My exact code:

using var ftpClient = new FtpClient(o.FtpHost, o.FtpUser, o.FtpPassword);
await ftpClient.AutoConnectAsync();
await ftpClient.UploadBytesAsync(jsonBytes, remotePath);

IGx89 on Aug 4, 2022

Your file attachment doesn’t appear to have uploaded fully?

IGx89 on Aug 4, 2022

Now complaining about profile.Credentials being null:

# AutoConnectAsync()

# AutoDetectAsync(True, False)

# Dispose()
Status:   Disposing FtpClient object...
Unhandled exception. System.ArgumentException: Required parameter is null. (Parameter 'profile.Credentials')
   at FluentFTP.FtpClient.LoadProfile(FtpProfile profile) in D:\Github\FluentFTP\FluentFTP\Client\FtpClient_AutoConnection.cs:line 517
   at FluentFTP.FtpClient.AutoConnectAsync(CancellationToken token) in D:\Github\FluentFTP\FluentFTP\Client\FtpClient_AutoConnection.cs:line 589

Looking at the code, it appears that both Credentials and Encoding are required but aren’t currently being set either.

IGx89 on Aug 4, 2022

Makes sense! I get a different exception with 39.0.2-beta1:

# AutoConnectAsync()

# AutoDetectAsync(True, False)

# Dispose()
Status:   Disposing FtpClient object...
Unhandled exception. System.ArgumentException: Required parameter is null or blank. (Parameter 'profile.Host')
   at FluentFTP.FtpClient.LoadProfile(FtpProfile profile) in D:\Github\FluentFTP\FluentFTP\Client\FtpClient_AutoConnection.cs:line 514
   at FluentFTP.FtpClient.AutoConnectAsync(CancellationToken token) in D:\Github\FluentFTP\FluentFTP\Client\FtpClient_AutoConnection.cs:line 589

Looking at the code, that makes sense since GetWorkingProfileFromHost, which is now returning not-null for me due to your change, doesn’t set profile.Host. Unclear how that would have worked in the past for others though.

IGx89 on Aug 4, 2022