Error when accessing web GUI

I tried to install Urbackup on a Debian Container using the Suse sources (Install package home:uroni / urbackup-server) for Debian 11.
When I try to access I just get a message: Error: connection failed.

Where can I start trouble shooting? I had a look at post Cannot access from web GUI from 2018, but that ended without any specific hints or a solution. As no backup ran, there is lots of space available.

As I am within the local LAN, there is no firewall involved.

Any hints are appreciated.

I started from scratch with a container based on Debian 10 and followd the instruction for Suse/Debian.
Now it is working fine.
Solved with workaround :slight_smile: