Internet service outage due to maintenance in Redmond, WA

Have you first tried power cycling / rebooting the modem ? 

 Is there any further info about the outage at their site here;

https://www.xfinity.com/support/status 

Use a cell phone internet service, a public WiFi hotspot, or a neighbor's internet if you need to in order to check it.

Or you can use their Xfinity App: https://www.xfinity.com/apps 

Hey there, @such_a_reliabe_internet_serice - Have you had a chance to review our Expert's advice, and did it help? Our Digital Care Team remains here to review and resolve things as quickly as possible if you're still facing any service issues. Just let us know!