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How to fix the NAT problem on Xbox 360!
Usually makes you unable to voice chat, party and multiplayer.


step 1.
sign out of xbox live.

step 2. find your router name and model. go search google for its firmware
download it. If you dont know how to install a firmware, google how to install firmware for [router name and model].

step 2. Log in to your routers settings. its ur local IP. If you dont know what your local ip is: open RUN. type in 'CMD'. type in ipconfing and alot of text appears. find standard gateaway* there is a IP. type that in ur adress bar and log in with admin - password (the one you log in to your internet).

step 3.
Enable UpNp. Google it if you dont know how to do it with ur router.

IF ALL ABOVE DIDNT WORK.
Go read this page How to fix the NAT problem on Xbox 360!