I'm gonna take a wild guess that it's a jave based chat server. Linux doesn't like java too well on the client side. Most of the time java is turned off in the browsers so you won't freeze or other crazy things. I'm not quite sure why this is so.
Actually you need to open the ports in your IPTABLES. I don't recall offhand which ports they were but running a packet sniffer on your network should tell you.
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