Hi there. OS: Debian 8 ISPConfig: 126.96.36.199p9 (clean installation, no upgrades) There are numerous threads on this matter, however I didn't find solution, thus I'm creating new thread. As mentioned, this is clean installation and for some strange reason TLS is not working - plain text auth is indeed working. Error in filezille: For every connection, on the server in the syslog there is the following error message: When I specify TLS on 2, then when I want to connect using plain text - then I also get this error, but when I switch to one, nothing happens, this error is displayed as well: Passive port range is specified: And it's firewalled. Any ideas?