unable to connect to server

I have xp /SP1 on my pc. I used to go a chat room but recently I am unalble
to do so as I always get message:
unable to connect to server
Firewall client is disabled. This all happened when I connected to work
recently and I guess some settings from my PC got in sync with work settings.
If this is not correct newsgroup, sorry, if I can get some directions as
where to ask for help. I tried to fix this myself but I am not that good with
all these settings.