Most irc's run a proxy detector so that probably will not help you. I would guess either the port or the ip is being blcoked. Have you tried runing a java based client that runs on the server instead of your pc? That way you would use the web port to get to the server, and then the server would connect to the irc.
8 +votes | 1 −votesProgramming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots, So far, the Universe is winning --Rich Cook