There is an unwritten rule in the homelab community. When something stops working, we immediately look at our own setup first. The same thing happened a few days ago. One morning, my external access broke. I checked everything from my internet connection to router settings, firewall, and reverse proxy. The server was running, the service was running, and the internet itself was working. And yet, external access was still dead. Everything was configured exactly the way it should be. Then I started rechecking everything, and this time I noticed something: the problem wasn’t inside my network at all. Something had quietly changed between my router and the wider internet without me noticing.