For some reason unknown to me one of my Plesk 8.1.0 servers won't do FTP very well anymore. FTP will accept connections and will login without problems but when login is complete and LIST comes next it fails to serve client. Following messages is shown on FileZilla: --- Command: LIST Error: Transfer channel can't be opened. Reason: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. Error: Could not retrieve directory listing --- /var/log/messages: --- Mar 6 01:07:10 xxx proftpd: xxx.xxx (xxx.xxx.xxx.xxx[xxx.xxx.xxx.xxx]) - FTP session opened. Mar 6 01:07:10 xxx proftpd(pam_unix): session opened for user xxx by (uid=0) --- Other server with exact configuration works with same FTP-client thought. What other logs should I check? Any ideas? Restarted the server but still same problem. I am almost certain that this started after I updated Plesk with the most recent minor updates. My other Plesk server was unaffected thought. It is also reported that some versions of FileZilla seems to work and so do WS_FTP in most cases. Help, please. Thanks.