Originally Posted by dragon
2. When you get a message saying "FTP session requested from unknown class" on Debian Etch 4.0 (ProFTPD Version 1.3.0) and you are trying to use MySQL authentication, this is probably due to the
in /etc/proftpd/modules.conf file, which line should be commented out.
I see this as a bug in the proftpd package, since I have NOT installed the proftpd-pgsql package, so this line should not be present, and also, at least it shouldn't affect the work of the proftpd-mysql package, which is successfully installed.
I would like to thank Falko for this line, mentioned in his tutorial (see up).
THANK YOU -- this also fixed my issue immediately. I was tearing my hair out after an upgrade to the latest dapper 6.0.6 release in repo, which is proftpd 1.3.0-9~dapper1
Just comment out the line listed above and restart proftpd. Started working correctly right away after that.