filezilla ftp client has stopped working correctly

End of stack trace from previous location where exception was thrown -Īt .Throw()Īt .HandleNonSuccessAndDebuggerNotification(Task task)Īt ._24.MoveNext()Īt ._Displa圜lass20_0.b_0>d.MoveNext()Īt ._21.MoveNext()Īt ._20.MoveNext()Īt ._18.MoveNext()Īt ._13_0>d.MoveNext() > : The remote server returned an error: (425) Can't open data connection.Īt (CloseExState closeState)Īt .(CloseExState closeState)Īt (Boolean disposing)Īt .d_19.MoveNext() > System.AggregateException: One or more errors occurred. System.AggregateException: One or more errors occurred.

Consider running the server on the same machine, and use 127.0.0.1 (to rule out NAT / Router / firewall issues), though this will also fail between remote computers.

Run it against newer versions of FileZilla Server (I used the latest, 1.5.1, but if I understand correctly this should happen on any version after FZ migrated from OpenSSL to GnuTLS).

Configure it to use TLS 1.2 / TLS 1.3 (the only ones that newer FileZilla servers support, at least on Windows).Set up a backup with FTP / Alternative FTP backend, Duplicati running on Win11.Net libs), but posting here in case others run into this and/or have more ideas.Ĭreated simple console apps that reproduce this, and posted the issue on FileZilla Server forum, waiting for a reply. I believe this isn't directly a Duplicati issue (rather Fluent FTP / underlying. 127.0.0.1 Duplicati and FZ Server running on the same machine). Note that after searching online a bit, I initially suspected NAT / Router / firewall configuration issues, however I ruled these out since the failures reproduce against localhost (i.e. TLS 1.3 - The file transfer doesn't start, server complains about TLS session not being resumed.TLS 1.2 - The file transfers fine, but the server returns an error due to client not properly terminating the session.Neither FTP (native FtpWebRequest) nor Alternative FTP (FluentFTP) worked with TLS 1.2 or TLS 1.3: The newer version requires TLS session resumption, protects against session truncation, and only supports TLS 1.2, TLS 1.3 for secure FTP. I've recently upgraded my FTP server from FileZilla 0.9.6 to 1.5.1

I have searched the forum for related topics.I have searched open and closed issues for duplicates.

Filezilla ftp client has stopped working correctly