"host unreachable" error if dig from inside a Docker container and use an external DNS

Hello,
if i try to resolve a DNS with 8.8.8.8 for example from inside a Docker container i get the error

11:45:43 dcef1022a64a:/# dig @8.8.8.8 google.de
communications error to 8.8.8.8#53: host unreachable
communications error to 8.8.8.8#53: host unreachable
communications error to 8.8.8.8#53: host unreachable

The Docker container was setup with Portainer. Portainer was installed via TrueNas App.

Right now i use Jailmaker (jlmkr) and have a Pi-Hole container running as my local DNS.
From inside the Test Docker container DNS resolve with my local works fine (see screenshot). I use the rtsp/net-tools docker image as testing container.

If i go into a Docker container which are in a jlmkr container i am able to dig @8.8.8.8 google.de

vb are from the jlmkr linux container.

Solved the problem.
It was a setting in the Fritzbox under Internet/Filter/Zugangsprofile which blocked the DNS request. :exploding_head: