Ok, so here's the situation: I've had xbox live since xmas more or less, connected to the 360s. Very few problems, occasional disconnections but nothing major. two weeks ago, my housemate also got a 360s and we bothe had a connection, all fine.
Then a few days ago, neither of them would connect. We've tried everything we can think of; increased MTU to 1458, power cycling, port forwarding, changing IP addresses to static, calling the ISP, who are saying that there are no problems on their end, all ports are open, so after a few calls to xbl support and the ISP, doing everything we can think of but we're at a dead end, so we decided to turn to the forums...
When testing the connection, on the more info screen, I get:
"Your console is connected to the internet but can't contact Xbox LIVE.
Turn your router or modem off and back on, then wait 30 seconds.
?Have you restearted your router or modem?'
Second suggestion is:
'Your console is connected to the Internet but can't contact Xbox LIVE.
Your router or ISP may be blocking access to Xbox LIVE.
On your PC, go to your router configuration webpage and make sure port 3074 is open on your firewall. If it is open, it may be blocked outside your home network. Contact your ISP.
If you're not familliar with networking, you can get help with firewall ports at www.xbox.com/networkhelp.'
Error status Report
W: 0000 - 0021
X: 0001 - 8005
Y: 0088 - 1C00
Z: 0000 - 0000
ID: FFFF - FFFF
Sooo... any new ideas?