Pi-hole v6 does not use lighttpd anymore, see also the release notes from Introducing Pi-hole v6.
Run from your Pi-hole machine, please share the output of:
sudo pihole-FTL --config webserver.port
Pi-hole v6 does not use lighttpd anymore, see also the release notes from Introducing Pi-hole v6.
Run from your Pi-hole machine, please share the output of:
sudo pihole-FTL --config webserver.port