Last week I was trying to connect to my FTP server after I rebooted the server machine and after a lot of time I didn't connect to it.

Normally, I use Filezilla FTP client to connect to FTP servers, and I'm running the version 3.5.3 under Windows.

On my own server I run VSFTPD under Linux and I've enabled FTPES (Explicit TLS/SSL) connections. All the times I connected before it connected without problems and after the connection was established I was only prompted for accepting my self-signed SSL X.509 certificate (if it was not saved into Filezilla certificates cache).

That day it disconnected and the bad error I received was:

I googled a little about it and I didn't find anything useful. So I started thinking things such as VSFTPD was damaged, so I tried to reinstall it, but without any changes. Then I thought it could depend on the certificate that was expired, so I generated a new SSL certificate, but that wasn't the solution again...

Finally, I tried to check my VSFTPD configuration, without noticing any errors. I really didn't know where to start again...

So I gave up for that day and I tried again the following day: I used another computer, where I had Filezilla 3.5.2. I tried connecting again, to copy the error again and googleing again to find a solution.

But this time it worked like a charm... so I tried to upgrade my Filezilla client and the error was again there: my efforts started to lead to some result! I finally found in the official Filezilla documentation that it was an error due to a different cipher suite supported by the new version of Filezilla that doesn't match the one used by VSFTPD. So, the easy solution was to add the

directive to the vsftpd.conf file, saving it and restarting the vsftpd daemon:

Now I can happily connect again to my FTP server with FTPES connections using my updated Filezilla client version!

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