I am getting this too. It just started. Although I haven't turned it on in about a week...it still was woking fine and now I am getting MTU error also during the 360 network dignostics check.
Well today live is offline bcoz of maintainance, but before that i could get online just fine. Even after adding the necessary ports for port forwarding it still didn't work, so i used manual settings for DNS and IP bcoz i had a PC that was alreafy using an ethernet connection(maybe IP conflict) so ws soon as i manually changed the IP it started to work, you guys try that
heres a pic:
http://i75.photobucket.com/albums/i295/ade2004/IP.jpg
for the last digit of the IP addres i changed mine to another number for my xbox live and it worked..........
Thanx for the reply...I already run with a static set up. I changed the IP just to see if it was some local routing issues with no luck. Still the MTU issue. Any other suggestions would be appreciated...
Thanx!
Al_Dente...
http://www.xbox.com/en-US/support/?WT.svl=nav
Xbox LIVE Service Status
Status:
As we gear up to bring you the New Xbox Experience, Xbox LIVE and the Xbox LIVE page on Xbox.com will be down for 24 hours, beginning on September 29, 2008 from 12:01 AM PST until 11:59 PM PST. During this time you will not be able to access Xbox LIVE.
These steps worked for me:
http://www.gamespot.com/pages/forums/show_msgs.php?topic_id=26489029&msg_id=306877087
HECK YEAH IT WORKED!!!
THANKS!!