Fidium Fiber Internet Not Working — Router & ONT Fixes

Applies to: Fidium Fiber, Consolidated Communications' fiber brand

Fidium is Consolidated Communications' fiber-specific brand — if you're in an area where Consolidated recently upgraded from older PPPoE-based service to newer Fidium fiber, you may have noticed your connection setup changed from PPPoE login credentials to a simpler DHCP-based connection as part of that transition.

1. Standard power cycle

1. Unplug both the modem and router from power.
2. Wait 30 seconds.
3. Plug the modem back in first and wait for all lights to stabilize.
4. Plug the router back in and give it time to reconnect.

2. Isolate modem vs. router

Connect a device directly to the modem via Ethernet, bypassing your router. If that works fine, the issue is with your router rather than your actual Fidium connection.

3. Bringing your own router instead of using the provided one

If your service requires PPPoE authentication and you're trying to use your own router instead of (or behind) the ISP-provided one, this is a genuinely tricky setup to get right:

• If your own router can't be configured with PPPoE credentials directly, or you want to keep using the ISP's router for authentication, connect your router's WAN port into one of the ISP router's LAN ports rather than trying to bypass it entirely — this creates a double-NAT setup, which works for normal browsing but can complicate things like port forwarding.
• If you specifically need to avoid double-NAT, look into whether your ISP router supports a bridge mode, which lets your own router handle the PPPoE authentication directly instead.
• MAC address cloning (matching your router's MAC address to a device that was previously getting a working connection) can help in situations where the ISP's system is tied to a specific device's identity.

4. IPv6 not available

Some Fidium/Consolidated Communications customers have historically found IPv6 unavailable on their connection, even on modern routers that fully support it — this has been a known network-side limitation in at least some areas rather than a router configuration issue. If you specifically need IPv6 and it's not working despite correct router settings, this is worth confirming directly with Consolidated Communications, since availability may vary by area and has been expanding over time.

5. WiFi unreliable while a wired connection is fine

1. Test a device connected directly via Ethernet cable — if that's stable while WiFi isn't, the issue is with your router's wireless side, not your actual internet connection.
2. Check for router firmware updates, and consider whether your router is old enough that an upgrade (particularly to WiFi 6) might be worth it if you're on a multi-gig plan.
3. Move the router away from other electronics and toward a more central, open location if interference seems likely.

6. Check for a wider outage

Before extensive local troubleshooting, check Consolidated/Fidium's status page or app, and confirm whether other devices in your home are affected the same way — this helps distinguish a genuine network-wide issue from something specific to one device or router.