AdGuard Home DNS requests timing out on Ubuntu Server
AdGuard Home DNS requests timing out on Ubuntu Server
Hi everyone,
I'm trying to set up AdGuard Home on Ubuntu Server, but DNS queries through AdGuard Home keep timing out.
AdGuard Home starts correctly and listens on port 53, and the web dashboard is accessible.
However:
dig .168.0.100 google.com
returns:
;; communications error to 192.168.0.100#53: timed out
;; no servers could be reached
The same happens locally:
dig u/127.0.0.1 google.com
Interestingly, the Ubuntu server itself can resolve DNS normally through the router. I confirmed with tcpdump that DNS requests to the router receive valid responses.
UFW is also inactive.
The AdGuard Home logs show that the upstream DNS is timing out. I initially configured Quad9:
https://dns10.quad9.net/dns-query
The logs contain:
exchanging with 9.9.9.10:53 over udp: read udp ...: i/o timeout
and also errors about the IPv6 Quad9 addresses being unreachable.
So it seems like:
Ubuntu → router DNS works
but:
AdGuard Home → upstream DNS does not work
What could cause AdGuard Home to be unable to reach the upstream DNS servers while Ubuntu itself can resolve DNS normally?
I'm running AdGuard Home directly on Ubuntu Server, not Docker.
Thanks!