Having trouble with halo 3 online?

[towlie_rules_aow]

Ok, please could anyone help me with this and don't say call 1-800-4-MY-XBOX. I have just recently started to play Xbox live, anyway I first tried Gears of War and it worked like a charm, but when I wanted to play Halo 3 I would find a match in match making, join and just as its about to start I receive a message saying I have signed out of messenger and then Xbox live, then after that I cannot reconnect to xbox live, I then use the network connection diagnostics tool (you know the network test) and it says that either I have failed the IP address test or the Xbox live test, I tried to power cycle the system, but that only lets me connect to live again, if I try Halo 3 it will start again! But like I said gears has no problem. I have my xbox connected to a Netgear CG814WG v3 modem and my ISP is Optus and I have a cable connection, I tried the xbox live setup wizard and my service provider and modem are not on the list (thought the v2 version of my modem is). If anyone could help it would be greatly appreaciated

 

[realgmr]

If you stay connected to LIVE during a session of GoW, but disconnect from Halo 3, then it most likely isn't an issue with you modem and something that you are probably going to have to call Microsoft about even though it is a real pain. Below is a link to Xbox Support on what to try if your IP continues to fail. Good luck.