When using a web proxy (set up manually in Edit->Preferences->Advanced->Proxy) I get a connection refused when trying to establish a secure connection.
Changing status to new. This is a known bug and release noted. I couldn't find another open proxy bug, so this will be the one for Mozilla.
Putting on nsbeta2+ radar.
Dupe. *** This bug has been marked as a duplicate of 31174 ***