Won't Load; DNS_PROBE_FINISHED_NXDOMAIN + Hairpin NAT

[g66lol]

I renewed my domain yesterday and all of a sudden the website stopped working.

When I try to go to the Cloudron dashboard (my.garrett.life), I get the error:

DNS_PROBE_FINISHED_NXDOMAIN

When I run cloudron-support --troubleshoot I get:

Vendor: DigitalOcean Product: Droplet
Linux: 6.8.0-45-generic
Ubuntu: noble 24.04
Processor: DO-Regular
BIOS pc-i440fx-6.1  CPU @ 2.0GHz x 4
RAM: 8131928KB
Disk: /dev/vda1       121G
[OK]    node version is correct
[OK]    IPv6 is enabled
[OK]    docker is running
[OK]    MySQL is running
[OK]    nginx is running
[OK]    dashboard cert is valid
[OK]    dashboard is reachable via loopback
[OK]    box v8.0.6 is running
[OK]    netplan is good
[OK]    DNS is resolving via systemd-resolved
[FAIL]  Could not load dashboard domain.
Hairpin NAT is not working. Please check if your router supports it

I'd been running the server for about a week when this happened. Everything was fine until I renewed the domain with Namecheap.

[g66lol]

Ok right after I post this, everything came back -_-.

Does anyone know what may have happened so I can prevent it from happening again?

[nebulon]

I can't see how this is related to renewing a domain, but the DNS system has many edge-cases and caches...

[g66lol]

@nebulon Right; my thoughts exactly. Some sort of weird hiccup I suppose. Thanks for confirming!

[GuillaumeRZ]

Same issue here on my EC2 instance :
Vendor: Xen Product: HVM domU
Linux: 6.8.0-1017-aws
Ubuntu: jammy 22.04
Processor: Intel(R) Xeon(R) CPU E5-2686 v4 @ 2.30GHz x 1
RAM: 980404KB
Disk: /dev/root 8.2G
[OK] node version is correct
[OK] IPv6 is enabled
[OK] docker is running
[OK] MySQL is running
[OK] nginx is running
[OK] dashboard cert is valid
[OK] dashboard is reachable via loopback
[OK] box v8.0.6 is running
[OK] netplan is good
[OK] DNS is resolving via systemd-resolved
[FAIL] Could not load dashboard domain.
Hairpin NAT is not working. Please check if your router supports it

[nebulon]

If Hairpin NAT is not working, please refer to https://docs.cloudron.io/troubleshooting/#hairpin-nat