Thanks, but I don’t think that’s it. I rebooted and also tried adding a new container to NGINX with a DuckDNS url and it won’t load on the local network.

Well like I said DuckDNS is working

Hm, pinging works and shows my (external) IP. But no device I’ve tested can load the duckdns URL.

EDIT: Two of the URLS show the local IP replying when pinged. Not configured any differently so I’m not sure what’s going on there. This was a PiHole thing apparently

Yes and DuckDNS is working flawlessly everywhere except that the network the server is also connected to.

Arris G36 but I don’t believe that’s the issue as it was working for years before now and on a different router too.

Thanks for the response but restarting the modem/router didn’t change anything, nor did creating a new container/NGINX config.