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