Recently i've been trying to get my Xbox up and running for about the first time in 3 months. When I first turned on my Xbox, i connected fine to XBL and starting playing MW3 to find i had a strict NAT. I tried opening it by restarting modem etc but then after that any game launched in the Xbox would disconnect me instantly like it needed to update although i had already updated. I would then try to test connection and it wouldn't work! The only way to reconnect was to restart my Xbox but then launching a game would disconnect me again...
I tried every step that the troubleshooter asked me to, restart modem, restart router, enable/disable UPnP on router, everything. I looked online to see if anyone else had the problem, and i found that a lot of people were having the problem and that deleting the XBL profile and re-downloading would fix it. Doing this only left me without a profile, i couldn't connect and download it back.
So now here I am, without an XBL profile and can't connect to XBL. I know it's got to be so something to do with my Router, even though I resetted it to default settings to see if it worked. I've never had this problem in the past, i don't know if some settings were mysteriously changed or what but I would like to fix this some time.
I have a Technicolor TG587n v3 Router if that helps, and my ISP is Bigpond.