Xfinity Internet Not Working — Router & Modem Fixes

Applies to: Xfinity/Comcast internet, rented and owned gateways

Xfinity outages and gateway problems tend to fall into a handful of recognizable patterns. Working through them in this order saves the most time before you'd need to book a technician visit.

1. Check for an outage first

1. Use the Xfinity app (My Account → Status) or xfinity.com/support/status to check for an outage in your area — ideally from a phone on cellular data, since your home internet is down.
2. If there's a confirmed outage, there's nothing to troubleshoot on your end — it resolves on Xfinity's side, usually with an estimated restoration time shown.

2. Do a proper power cycle, not just a quick unplug

A lot of people unplug for a few seconds and plug back in, which often isn't long enough for the gateway to fully release its old connection state.

1. Unplug the gateway's power cable completely.
2. Wait a full 30 seconds — not 5, not 10.
3. Plug it back in and give it 3-5 minutes to fully reconnect before checking again.

3. Read the light color and pattern

• Solid white: normal, connected.
• Blinking blue: in setup/pairing mode, not yet fully connected.
• Solid or blinking orange: typically a connectivity problem reaching Xfinity's network — after a power cycle, this is often the point to check for an outage or a physical line issue.
• Solid or blinking red: a more serious connection failure — after a full power cycle with no change, this usually means it's time to contact support or schedule a technician.

4. Check the physical connections

1. Confirm the coaxial cable is fully screwed in at both the wall outlet and the back of the gateway — not just resting in place.
2. If you have multiple coax outlets in your home, try a different one if the current one has never been confirmed to work.
3. A loose or damaged coax cable is a common, easy-to-overlook cause that a power cycle won't fix.

5. Recently moved, or just had service transferred?

If the gateway shows a persistent yellow or red light specifically after moving to a new address, and a full power cycle hasn't helped, this often means the account hasn't been fully activated at the new address yet on Xfinity's side — not a hardware problem. Confirm the activation status through the app or with support before troubleshooting further.

6. Replaced Xfinity's gateway with your own router?

If you've put the Xfinity gateway into bridge mode and connected your own router, and the new router shows an internet-connection error despite a working cable and port, the gateway's MAC address binding is a common cause — it can stay tied to the old device's MAC address after a hardware swap.

1. Fully power off both the gateway and your new router.
2. Disconnect the coaxial cable from the gateway for a full 5 minutes — this forces a MAC address release on Xfinity's side.
3. Reconnect everything and power back on, starting with the gateway, then your router once the gateway is fully up.

7. WiFi is unreliable, but a wired connection works fine

If a device connected directly by Ethernet cable stays online with no issues while WiFi drops constantly, that isolates the problem to the wireless radio or WiFi configuration specifically — not your actual internet connection. Try moving the gateway to a more open location away from other electronics, or check whether too many devices are competing for an older, more congested WiFi band.

FAQ