Players can see co-op campaign game, but can not connect

[Tek7]

When I host an Unreal Tournament 3 co-op campaign game, players can see the game, but they can not connect and receive a "Connection failed" error.

I have opened the following UDP ports on my router:

6500
7777
7778
7787
13000
27900

I have tried setting my computer to use both a dynamic and a static IP address. Neither works.

I have UT3 unblocked in Windows Firewall.

I am running Windows Vista Ultimate SP1 on a Dell Studio 1737. I connect to the network and the Internet wirelessly.

Please advise.

[Tek7]

Well, it made me cringe to do it, but I put my notebook computer in my router's DMZ. After I did, people were able to join my games.

So I open up all the ports listed in my original post (6500, 7777, 7778, 7787, 13000, 27900) and people can't connect.

I put my notebook computer in the DMZ and people can connect.

Do I need to open additional ports (or open them as both TCP and UDP instead of just UDP) to make my co-op campaign games joinable without putting my notebook in the DMZ?

(Also posted (http://forums.steampowered.com/forums/showthread.php?t=835402) on Unreal Series Steam Forums (http://forums.steampowered.com/forums/forumdisplay.php?f=377).)