AT&T Broadband Red Light — What It Means & How to Fix It

What Does This Error Mean?

A solid red broadband light on your AT&T gateway means the modem cannot establish a connection with AT&T's network. The light should be solid green when everything is working. Red means the gateway is powered on but the internet connection has failed. This could be a line fault, an outage, or a problem with the gateway itself.

Affected Models

AT&T BGW210 gateway
AT&T BGW320 gateway
AT&T NVG589 gateway
AT&T NVG599 gateway
AT&T Pace 5268AC gateway
AT&T Fiber and DSL customers

Common Causes

AT&T has a service outage in your area affecting DSL or fiber service
The fiber or phone line entering your home has been damaged or disconnected
The DSL or fiber line has not been provisioned correctly on AT&T's network
The gateway's PPPoE credentials have expired or been changed
The gateway itself has developed a hardware fault after a power surge

How to Fix It

Restart the AT&T gateway. Press the restart button on the back (usually a small pinhole), or unplug the power adapter. Wait 60 seconds, then power it back on. Watch the broadband light — it will take 2–3 minutes to go from red to green.

A reboot resolves temporary connection failures caused by line blips or session timeouts.
Check the DSL or fiber cable going into your gateway. For DSL, it is a phone cable (RJ-11). For fiber, it is usually an Ethernet cable from the ONT box. Make sure it is firmly plugged in.

A loose cable is a fast, easy fix that is often overlooked.
Check the AT&T Smart Home Manager app or att.com for reported outages in your area.

A red broadband light during a regional outage is normal — nothing you do will fix it until AT&T restores service.
For fiber customers: check the small white ONT box (usually near where the fiber enters your home or in a utility closet). If it has a red or unlit power/PON light, the fiber signal is the problem — call AT&T.

The ONT is AT&T's equipment. You cannot fix an ONT fault yourself.
Try a factory reset of the gateway as a last resort. Hold the reset button on the back for 10 seconds. Note: this erases your Wi-Fi name and password. After the reset, check whether the broadband light turns green.

Only do this if AT&T support recommends it or if all other steps have failed.

When to Call a Professional

A red broadband light almost always requires AT&T's involvement. Call AT&T support at 800-288-2020. Ask them to run a remote line diagnostic. If there is no fault on their equipment, they will send a technician to inspect the line at your home. AT&T fiber customers should also check whether the ONT (white box outside or in a closet) has a red or flashing light.

Frequently Asked Questions

My AT&T broadband light is red after a storm. What should I do?

Storms can damage outdoor cables, joints, and fiber splice points. If the red light appeared during or after severe weather, the fault is very likely outside your home. Call AT&T and report the outage. Do not attempt to touch or inspect any outdoor cables or connection boxes yourself — these can carry electrical current.

The broadband light is red but my Wi-Fi is still showing on my phone. Is that normal?

Yes, this is normal. Your gateway still broadcasts Wi-Fi even when there is no internet connection. You can connect to the Wi-Fi name, but there will be no actual internet access. The red broadband light confirms the internet connection is broken — the Wi-Fi just shows the gateway is powered on.

How long should I wait before calling AT&T about a red broadband light?

If a full restart does not fix it within 5 minutes, call AT&T. Do not wait hours before calling — AT&T can run a remote line test immediately. Have your account number ready and mention that you have already restarted the gateway.