Why is My Xfinity Ethernet Not Working?

One can simply find the reasons and solutions of Xfinity Ethernet not working; some of them are:
 You must check that your power strip is turned on and all cables are properly connected
 Now, you should connect the Ethernet cable directly to your computer; you must avoid any routers and network devices
 You should keep a check on the router or configuration
 You must restart your computer and re test your connection

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