We're excited to announce that we've fully migrated the Xbox Forums to their new home, here on the Microsoft Community forums!
As of today, going to forums.xbox.com will redirect you here to the Xbox area of the Community forums. We've moved all of your existing threads over so you can continue and start conversations with the new forums experience.
We sincerely appreciate the feedback you have provided over this transition and can't wait for you to check out the new Xbox Forums!
i had the same exact problem man i run to 360s on one network came home and bam nat type strict try resetting your UPnP like disable it save settings then turn off the modem then turn modem back on and enable it and it should work it worked for me anyways