AdGuard Home LXC no internet connection

[blu2b]

Hello everyone,
I hope this is the right spot to ask for help for a specific script.

It is my first time using Proxmox so I am pretty sure the error is on my end.

I have installed Proxmox VE 8.3.3. I have run the Post Install Script. Then I have started running some more scripts like Adguard, haos.

The script for AdGuard Home LXC was successfull and I am able to login to the UI. But as soon as I login, there is a Bad Gateway (502) error requesting the version. When trying to add additional DNS blocklists I do get a a Bad Request (400).

What I have tried so far:

• I have done some research on the internet based on my knowledge
• I checked the internet connection of the container. I have successfully made a ping and nslookup for google.com
• I have checked that AdGuard Home is listening on port 53 (I have another instance of Adguard on a seperate machine. I removed the DNS from my router to be sure there is nothing wrong on that side)
• I have checked /etc/resolv.conf

root@adguard:~# cat /etc/resolv.conf
# --- BEGIN PVE ---
search fritz.box
nameserver 192.168.178.1
# --- END PVE ---

• I have shutdown all other LXCs and VMs
• I have turned off the firewall for the LXC
• remove LXC and re-run the script

Do you have any idea where I can start?