i think kazza lite version 2 or something lets you choose your port, so if youre behind a firewall all you have to do is find an allowed port and you can use that
thats how i understood it. personally i hate firewalls they always manage to stuff up a perfectly good real time strategy game
try your HTTP ports first. but should you have a decent IT pro, you will NOT get through with that limp karate, Daniel san, you need to get something that will let you tunnel with love. see above post.