I tried all the above suggestions, and after making the last changes powered off the router/modem and Xbox 360 both. I left the router/modem for the recommended five minutes, then plugged in and powered up the Xbox 360 again. The Xbox 360 still couldn't connect to the Internet.
Help connecting Xbox 360 to internet via wired broadband Jul 15, 2013 How to connect xbox 360 on a wired internet? | Yahoo Answers Nov 25, 2012 How to connect XBOX 360 to PC using Ethernet Cable (Wired
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Wired connection; A wired network connection is the fastest and most reliable way to connect to Xbox Live. For a wired connection, you use a network cable to connect your Xbox 360 console to a router or modem. Here's what you need: A router, gateway, or modem ; A network cable ; A high-speed Internet connection such as cable or DSL Wired connection to Xbox not working - NETGEAR Communities
May 08, 2020
Making the Hardware Connections Plug one end of the Ethernet cable into a network port or port on your router. If your Xbox is the sole device on your Plug the other end of the Ethernet cable into the back of your Xbox 360. How to Fix Common Xbox 360 Wireless Networking Problems May 08, 2020