MTU Failure

So, tonight I go to jump on and play some SC IV and I turn on my xbox to find that it wont connect to live. So, I go to the diagnostics to check out whats up and find that it's an MTU failure. So, I plug it into google on my computer ( which still connects ) and I change my MTU number to 1364.... no effect. I'm running and linksys wireless G WRT54G2.

Any hints or am I just gonna have to call microsoft??

oh yeah heh

A. forgot about the maintenence ( didnt write it in my planner.... )

B. I've had network problems before so figured it was just another night of playing with internet connections.