There can many many reasons due to which your Xfinity router is offline. It can be because of outdated system or server error. There can be some misconfiguration in settings or corrupted network. Here’s some ways you can try if
Xfinity router not online. Reboot your router and perform the power cycle. Navigate to settings in your account and make sure there isn’t any pending update. Go to your account and select manage network. Then, click on the option to restart modem to begin troubleshooting. If the device is still offline, reset it to default settings.