What Country/State/Province do you live in? Norway, Sogn og Fjordane.
Modem brand & model number: Router is plugged directly into the wall.
Router brand & model number: ZyXEL P-2812HNU-F3.
If Wireless, are you using a white or black external adapter, or an internal (Xbox 360S) adapter? Wireless, tried both white and black external adapters.
Things you have tried: Resetting the router to factory defaults, resetting the console's network settings to factory default, connecting/reconnecting to the wireless network, several troubleshooting suggestions on the Xbox Support pages.
Is UPnP Enabled? I have tried both enabling and disabling it.
Do you have a NAT error? If so, what is your NAT? No.
Any Error Codes you encounter: None.
Who is your ISP(Internet Service Provider)? Telenor.
After you run "Test Xbox LIVE connection" press “Y” for "More Info”. In the pop-up that appears, what are the following values, if shown? (If a value below does not appear for you, just leave it blank.)
C: 220.127.116.11, 18.104.22.168
We recently upgraded our Internet connection in the house, and because of this we had to get a new router(installed around the 20th of February). Friday(23rd of March) was the first time since we changed the router that I used my Xbox, and I was disconnected almost immediately. Despite trying to reconnect several times, the problem would not go away. The longest I could stay connected was around five minutes. This was with a white wireless adapter. The following day, Saturday, I tried using my brother's black wireless adapter, and noticed an instant improvement; I stayed connected the entire night, no issues whatsoever. However, on Sunday, the problem was back. The longest I managed to stay connected was around 30 minutes once, but otherwise the disconnect happened more or less instantly after reconnecting.
At first I thought it was because of the router and/or my wireless adapter(being that it is well over three years old), but I quickly dismissed that theory after having tested with my brother's Xbox, and he can stay connected just fine(which is also the case when I tested my white adapter on his Xbox). I have tried resetting the router numerous times, resetting the Xbox, unplugging(and leaving them unplugged for a while) every cable(be it power cords or otherwise) connected to both the router and the Xbox, enabling and disabling UPnP, and changing wireless channels, all to no avail. I have, however, confirmed that everything seems to be working fine if I use a cable, but due to the router's placement, that is not a possible permanent solution. I also highly doubt it could be because of a weak signal, seeing as my brother's Xbox is placed much further away from the router than mine is. I have tried getting my head around this problem for days, and I have now run out of ideas. The one theory I have left now is that maybe the USB port is shot, seeing as changing wireless adapters does not help, but using a cable is seemingly OK. I am hoping there are some brilliant minds out there that can figure out what is causing this, and if there is a fix for it.
Thank you very much for your time.