How to fix a smart hub or bridge that is not connecting

This should become one of the strongest support articles in the site because hubs influence many child-device pages.

1. Check power, cabling and status LEDs.
2. Verify local router link state and IP assignment.
3. Confirm the hub is tied to the correct owner account and home.
4. Review recent firmware or ISP/router changes.
5. Only factory-reset after basic cable, router and account checks fail.

Ideal parent page for hub not connecting and bridge offline clusters.