ProFTPD: Error with PHPStorm

When I set up a new development environment, I almost despaired because my PHPStorm did not want to transfer data via FTP. The upload process just ran endlessly.

However, the cause was quickly found in the error log of ProFTPD:

client did not reuse SSL session, rejecting data connection (see the NoSessionReuseRequired TLSOptions parameter)

This error can be solved with a configuration change. To do this, simply write the following in the file /etc/proftpd/conf.d/tls.cnf:

TLSOptions NoSessionReuseRequired

Now restart ProFTPD and PHPStorm can upload and download files.