I’ve been using T-mobile home internet for about a month now and have had a lot of problems playing on xbox live. I read somewhere on one of these forums that you need to go to your network settings on xbox and continuously “test again” the NAT type until the NAT type states “open”. At this point the UPnP should be enabled. My NAT type always ‘starts’ on moderate so I’m not sure if this will work if your NAT type is initially closed. This has been a very consistent solution for me as it has worked for me every time I play online. Unfortunately, you need to do this every time you turn on your xbox and want to play online - but it only takes 1-3 tries (20 seconds/test). I’m not sure if this fixes chats, etc. though. Godspeed friends.
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