solid red on Xfinity Gateway: A steady red light on the Xfinity Gateway means the device cannot establish a connection with Xfinity (Comcast) — no internet signal is being received..
A steady red light on the Xfinity Gateway means the device cannot establish a connection with Xfinity (Comcast) — no internet signal is being received.
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Most likely causes
Loss of signal from Xfinity (Comcast) (cable/DSL/fiber issue)
A Xfinity (Comcast) outage in your area
The Xfinity Gateway is not provisioned or was deregistered
A hardware fault in the Xfinity Gateway
Try this first
Power-cycle the Xfinity Gateway and wait 5 minutes
Check that the cable from the wall is firmly connected
Look up Xfinity (Comcast) outage status in the Xfinity app app
Contact Xfinity (Comcast) — the device may need to be reprovisioned
If prompted, replace the Xfinity Gateway with a known-good unit