[Johnny Alpha]

Here's what it says on page 14 of the MOHAA Install Guide:

"Medal of Honor Allied Assault uses the following TCP and UDP Port(s) for Internet play:

TCP Port: 12203 (default), 12204-12206
UDP Port: 12203 (default), 12204-12206

Note: You will need TCP and UDP Ports 6667, 3783, 27900, 28900, 29900, 29901, 13139 and 6515 open to use Gamespy to connect to Internet servers"

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Also, I wonder if you are using something like ZoneAlarm. If so, you will have to set it up to allow server for both MOHAA and Gamespy.

Hope this helps.