Lighttpd for pi-hole and piaware blocking piaware site on same host

Problem with Beta 5.0:
I am running Lighttpd on port 6680 (Apache2 is on port 80).
Pi-Hole v5 works as expected

In parallel I run Piaware which also uses lighttpd.
Now I get the following error when trying to access the Piaware site.

Do I need to "whitelist" my on raspberry or change something?

Debug Token:

The page you are seeing is in reality a 404 error. The URL for the piaware site isn't found.