Getting "Error 400 - trying to redirect" when trying to load the site after installationscript

Hi,
i have installed a clean server with ubuntu 22.04 - minimal-install with ssh
Changed in /etc host and hostname. I would like to use "server.domain.tld" - checked that with a running ISPConfig-server and it is done the same way.
The Script ran, i can ssh into ubuntu where i see all services running.
If i put the ip in the browser i see the standard page that apache gives me, so apache is working.
I get "Error 400 - trying to redirect" when i use (example-ip) 123.456.123.456:8080/login/

I ran the testscript which tells me "[WARN] could not determine server's ip address by ifconfig"
In the list of listening ports i see:
*:*:*:*::*:8080 (174128/apache2)
*:*:*:*::*:8081 (174128/apache2)

UFW is disabled (at the moment)
I have made DNS-records for domain.tld / mail.domain.tld / server/domain.tld

What could i have done wrong?
I am gratefull for any hint.

Regrads,
Jan

 

Sorry,
i was probably a bit impatient.
The IP with :8080 brings me ISPConfig, so i can continu to install the rest.
Thanks for all the work that was done to make this software.

Regards,
Jan