Hello, Is there a way to use Pi-hole V6 over http instead of https ? Thank you

The issue is you have lighttpd running on port 80 (probably a leftover from a previous Pi-hole v5 install). If you need to keep lighttpd, you have 2 options: change lighttpd port (to something different than 80) or change pihole port. If you are not using lighttpd, you can safely disabled it (or…