Unable to play games on XBox Live

I have a XBox Elite with gold membership. My XBox is connected to my Netgear router which connects to the internet.

I can connect my xbox to Live fine. I can get updates and stuff. But when it comes to playing a game on Live, I can't start the game.
For Halo 3, it drops out before the match starts and for Fifa 10 it drops off while trying to get Roster Updates needed to play the game.

I have tried setting up port forwarding but that didn't help. I even put my XBox in the DMZ to try to get it to work, but it didn't.

Has anyone else had such a problem and if so, how did they solve it?
 
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