Adguard Home communications error to 127.0.0.1#53: connection refused

When you cannot update OPNsense and you see an error in a SSH session when you try to run:

root@OPNsense:~ # dig @127.0.0.1 -p 53 google.com

dig @127.0.0.1 -p 53 google.com

You probably have a wrong binding in the Adguard config file.

To solve this issue:

nano AdGuardhome.yaml

cd /usr/local/AdGuardHome

Change the bind (from a local ip address) to:

dns:
  bind_hosts:
    - 0.0.0.0

Then restart Adguard Home