I have openSuse 11 with ISPConfig. (http://www.howtoforge.com/perfect-server-opensuse11
I already tried all of the suggestions you post and the problem is the same.
I try to connect with Total Commander.
I have another 2 servers with ISPConfig but with Suse 9.3 and everything works fine on it. But... in openSuse 11 don't. Can you help me?
PS: With WebFTP from ISPConfig everything works fine; with Joomla works fine too.
Please, help me!