If an Xbox 360 cannot connect to the internet, there is likely a problem with the network, the console, the user's internet provider or Xbox Live. If the console displays an error code, users can enter it at Support.Xbox.com to diagnose the problem and read a specific solution.
To diagnose and troubleshoot connection problems, first press the silver Guide button in the center of the controller and navigate to Network Settings. Find the correct network in the list and select Test Connection. If there is a problem with the connection, the console displays an error code. Microsoft also offers free online chat support.