CP:
I do not use an airport base station but have set some prefs in the Sharing pane of System Preferences, the Firewall tab.
What I did was simply create two additional entries by clicking "New..." and then making one entry I called UT Server 1 and opened the ports 7777, 7778 and 7787. I then made a second entry, UT Server 2, in which I opened port 28901.
Now, as I said there may be something else involved for airport. I have a Linksys router and did the same as the above using the web interface. I don't honestly know what is truly necessary (one versus the other versus both) but it works for me.
I hope this gets you started...let me know.
coitus
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