Problem Connecting to TCP/IP Game

[Hellboy]

One of my players is not able to connect to a new game that I am hosting (thread where this is problem came up is here). We've tried a number of things along the way of debugging, but the upshot is that the player (Foodstamp) is able to connect to another game of mine on a different port (the first game is on 1024, the new one on 1025), but he's not able to connect to this new game.

He's able to connect to an arbitrary game on Gandalf's server (which happened to be using port 8982), so I set up a test game w/ 8982 on my machine. Still no luck.

Anyone have any insights/suggestions?

I'm serving from a Dell Dimension 4400 w/ Windows XP. This is the second instance of dominions running on the box, and nothing else is being done w/ the machine other than serving these 2 games.

Note: Please no comments on wusses who use Windows XP as a server are invited or required.