FBSD 7.2 - ports blocked but no firewall

[Gene]

Hi-
I'm running 7.2 GENERIC and installed the unrealirc port. I've started it up 
and can connect from localhost just fine. But when attempting to connect from 
the outside world (eg. from another box on the lan) I get connection refused.

I've tried both with and without ipfilter running (with appropriate rule).
Other ports are reachable including a non-standard port used for ssh.

The question: Could there be any reason that port 6667 might be blocked? 
(Unrealircd questions can be taken up elsewhere).

IHN,
Gene

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