FileZilla FTPS Upload TLS failure

[Fabian-Tech]

FTP OS: Windows 10

FTP Server: FileZilla Server 1.5.1

Computer OS: Windows 10

FluentFTP Version: 39.4.0

Framework: .NET Framework 4.8

When I try to upload a file to a FileZilla Server on my local machine using TLS I get the following error:
425 Error while transfering data: ECONNABORTED - Connection aborted
The file seems to be uploaded correctly, but the FTPStatus is failed.

This is possibly a duplicate / closely related to #771, which is still open but supposedly was fixed.

Code:

            FtpClient client = new FtpClient(url, login, password);
            //TODO: UNSAFE!
            client.ValidateAnyCertificate = true;
            // connect to the server and automatically detect working FTP settings
            client.AutoConnect();
            var response = client.UploadStream(ms, filepath, FtpRemoteExists.Overwrite);

            // disconnect! good bye!
            client.Disconnect();

Logs :

FluentFTP:

# UploadStream("Test/Hello World2.txt", Overwrite, False)

# FileExists("Test/Hello World2.txt")
Command:  PWD
Response: 257 "/" is current directory.
Command:  SIZE /Test/Hello World2.txt
Response: 213 50320

# DeleteFile("Test/Hello World2.txt")
Command:  DELE Test/Hello World2.txt
Response: 250 File deleted successfully.

# OpenWrite("Test/Hello World2.txt", Binary)

# GetFileSize("Test/Hello World2.txt")
Command:  SIZE Test/Hello World2.txt
Response: 550 Couldn't open the file or directory
Command:  TYPE I
Response: 200 Type set to I

# OpenPassiveDataStream(PASV, "STOR Test/Hello World2.txt", 0)
Command:  PASV
Response: 227 Entering Passive Mode (127,0,0,1,25,39)
Status:   Connecting to ***:6439
Command:  STOR Test/Hello World2.txt
Response: 150 Starting data transfer.
Status:   FTPS Authentication Successful
Status:   Time to activate encryption: 0h 0m 0s.  Total Seconds: 0,0029907.
Status:   Disposing FtpSocketStream...
Response: 425 Error while transfering data: ECONNABORTED - Connection aborted
Command:  QUIT
Response: 221 Goodbye.
Status:   Disposing FtpSocketStream...

FileZilla Server:

Info [Type] Message
FTP Session 84 127.0.0.1 anonymous [Command] STOR Test/Hello World2.txt
FTP Session 84 127.0.0.1 anonymous [Response] 150 Starting data transfer.
FTP Session 84 127.0.0.1 anonymous [Trace] tls_layer_impl::continue_handshake()
FTP Session 84 127.0.0.1 anonymous [Trace] tls_layer_impl::continue_handshake()
FTP Session 84 127.0.0.1 anonymous [Trace] TLS Handshake successful
FTP Session 84 127.0.0.1 anonymous [Trace] TLS Session resumed
FTP Session 84 127.0.0.1 anonymous [Trace] Protocol: TLS1.2, Key exchange: ECDHE-X25519, Cipher: AES-256-GCM, MAC: AEAD, ALPN: 
FTP Session 84 127.0.0.1 anonymous [Trace] session::on_socket_event(): source = data, flag = 2, error = 0, state = 2
FTP Session 84 127.0.0.1 anonymous [Error] GnuTLS error -110 in gnutls_record_recv: The TLS connection was non-properly terminated.
FTP Session 84 127.0.0.1 anonymous [Status] Client did not properly shut down TLS connection
FTP Session 84 127.0.0.1 anonymous [Trace] tls_layer_impl::shutdown()
FTP Session 84 127.0.0.1 anonymous [Trace] data_socket_->shutdown() = 126
FTP Session 84 127.0.0.1 anonymous [Response] 425 Error while transfering data: ECONNABORTED - Connection aborted
FTP Session 84 127.0.0.1 anonymous [Command] QUIT
FTP Session 84 127.0.0.1 anonymous [Response] 221 Goodbye.

[FanDjango]

So: I have done the research on this.

You have FluenFTP V39.4.0.

Nearly a month ago PR #944 addressed exactly this problem. Merged into master on September 10.

It came into Nuget Release V41.0.0 on October 2.

#944 explicitely mentions the wrong order of ssl stream shutdown, as seen from a vsftp server. This happened on any server type - and each server type reacts differently to this. Some more lenient and some less so.

If you read #944 and also read the article mentioned therein (this), you will agree it is the same problem as yours.

Ergo - I advise updating to FluentFTP V41.

[FanDjango]

Please follow this on #996.