Hi there.
Really strange issue for me: pidgin clients easily connect to openfire server but none from psi (psi and psi plus). Psi output that user is not authorized and psi plus just trying to connect all the time without success. I use only encrypted connections btw.
Maybe it will be helpful to someone. I have just tried to login with Psi 0.15 32-bit and i wasn’t able until i specified the IP address as a host, though my servername is perfectly resolvable in my network and other jabber client have no problem logging in by server’s name.