I setup a proftpd server that uses TLS/SSL certificate for authentication.
Everything works well when I connect through lftp or Filezilla (with explicit connection).
But once I attempt connecting with simple ftp connection from Filezilla, the USER command ends with the 550 response (SSL/TLS required). After that any further connection through lftp or Filezilla (with explicit connection) will hang authenticating.
Anyone knows how to workaround this issue? Is there a way to ask Filezilla to automatically use TLS/SSL if required?
I am using Ubuntu server 10.04 with proftpd 1.3.2c. There is no error message in the log files.
Best Answer
After upgrading from proftpd v1.3.2c to v1.3.4a, the problem does not show up any more.
This was indeed a proftpd bug...