No, tried to access directly from the same LAN.
I was asked during setup. First time I selected “no”. But I also reinstalled DietPi a couple of times and tried even with activated access from wan. Always same result…
My first idea was, that lighttpd is not running, but an dummy index.html was accessible. Renaiming admin folder to admin1 worked as well. So only the admin and the pihole directories are blocked.
Will test the command tomorrow…