Many fiber internet problems come from dirty connectors or loose plugs, not major faults. Power cycling or restarting your ONT (Optical Network Terminal) often resolves simple troubleshooting internet issues. First, check the basics—look for power issues on your optical network terminal and inspect all cables for visible damage. This guide will walk you through diagnosing and resolving common. Despite multiple attempts, the Archer AX6000 v1. The blue light on top of the router spins around for a few minutes as it tries to negotiate a connection and then fails and turns red. The information in this document is based on all Catalyst 9000 Series switches.