Armstrong Internet Not Working — Modem & Router Fixes

Applies to: Armstrong cable and fiber internet

1. Standard power cycle

1. Unplug both the modem and router.
2. Wait a few minutes.
3. Plug the modem back in first and wait for its lights to fully stabilize.
4. Plug the router back in and give it time to reconnect.

2. Third-party router won't connect after Armstrong upgrades your equipment

This is a real, documented pattern worth knowing about: after Armstrong replaces or upgrades fiber/modem equipment, some third-party routers fail to get a working IP address from the new modem — showing a link light but never actually connecting — even though the same router worked fine with the previous equipment. Interestingly, this has affected some router brands/firmware more than others, with certain open-source firmware (like DD-WRT or Tomato) sometimes connecting without issue when a stock router firmware doesn't.

1. Confirm the issue is specific to your router by connecting a computer directly to the modem — if that gets a working connection, your Armstrong service itself is fine.
2. Try power cycling both devices again, in the correct order, after confirming the direct connection works.
3. If the issue persists, this may be a genuine compatibility gap between your specific router and the new equipment — worth confirming with Armstrong support, since they may be aware of similar reports.

3. Locked out of your combo unit's settings

Some Armstrong-provided combo modem/router/MoCA units have fully locked settings that you can't access or change at all, even with admin credentials — this isn't a bug, it's how some equipment is configured. If you want more control over your own network (using your own mesh WiFi system, for instance), the real, working option is to buy your own separate modem and have Armstrong activate it on your account — this is usually done at no additional charge and takes just a few minutes over the phone.

4. Isolate modem vs. router

Connect a device directly to the modem via Ethernet, bypassing your router. If that restores internet, the issue is specific to your router's configuration rather than your actual Armstrong connection.

5. Check for a wider outage

Before extensive local troubleshooting, check Armstrong's status page or app, and confirm whether neighbors or other devices in your home are affected the same way — this helps rule out a genuine area-wide issue before assuming it's your own equipment.