Hey there arts!
Just to rule things out, Do you have the full game? If you have configure manual DNS settings, which ports have you opened? Also, if you have manual DNS settings make sure you have disabled UPnP.
Try restart your network equipment.
Turn off your Xbox 360 console and all network hardware (for example, your modem and router).
Wait one minute.
Turn on your modem and wait for it to come back online (one more minute).
Turn on the next piece of hardware (for example, the router), and wait another minute.
Post back and let us know how it goes.
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