I restored my pi-hole v5 backup on a new pihole v6 docker.
then I went to change the unbound address from 127.0.0.1 to 192.168.180.1
and the webinterface stops working and portainer mentiones unhealty.
restarting the container seems to fix this issue.
however I think I mention this anyway.
at the moment I'm still using my old pi-hole by default, so I wouldn't know how v6 acts in the real world.
Can you replicate the issue with a fresh container? If so, please post a debug token.
Do you see any errors in Portainer logs?
If you didn't remove the container yet, go to the Portainer interface, select Containers, find your Pi-hole container and click on the log icon:
If there are error messages, click on the "Copy" button and paste the logs here.
I didn't remove the container but unfortunately my logs don't go back that far.
One thing I found out after posting this was that unbound on the remote machine was listening on the wrong port making the DNS server unavailable for pi-hole.
I am not sure if I can replacate this issue on a fresh one. for this I need time to setup the environment and I don't have this at the moment