Your modem is offline

First. Check here for official info on any possible local outages;

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 the Xfinity App: https://www.xfinity.com/apps 

@user_hw5abx I am sorry to hear your modem was offline. We offer convenient self-service options to check service interruptions through My Account, the Xfinity App, or the Xfinity Status Center at http://www.xfinity.com/support/status. Have you checked there yet? If no interruption, I want to make sure we are respecting your time and not repeat the steps you have taken previously. What additional troubleshooting steps have you taken? 

I also wanted to make sure you are aware that any time you need to troubleshoot our Xfinity app can assist you step by step. It is not just to pay your bill or to get notifications about interruptions. To learn how to troubleshoot in the future you can follow the link: https://www.xfinity.com/support/articles/using-xfinity-app. Honestly, it is the best app to date that we offer and super easy to use for all of your account needs!

@user_hw5abx 

Were you able to find any outage info at that link ?

@XfinityDena 

I guess that the link that I posted is invisible......