I need help.

I have 2 jtagged units which are connected wirelessly to the T-PLink N routers thru wireless N adapter. Both have their own IP addresses. When I run a game like Modern Warfare 2, thru System link, on my other jtagged console I can see the started game, if I join the game, it shows a count down and then after 11 secs it says timed out and I am not able to connect.

Again I can see the other game and I have tried this with Forza and other games. Again it finds the game on the other unit but is unable to join.

Any help is very appreciated. Thanks.