FTP Problem 2020/02/08

My FTP doesn't connect since I upgraded. Some sites are ok to connect. I can't connect with the ftp server that I configured, but it works with other ftp clients.
Can you solve the problem?

Please link your account and provide more detail about the problem, e.g. FTP logs.

The FTP Doesn't Work FAQ has suggestions on what to try and where to look for the logs.