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If you are Experiencing issues with a Pi-hole install that has non-standard elements (e.g you are using nginx instead of lighttpd, or there is some other aspect of your install that is customised) - please use the Community Help category.
Expected Behaviour:
Visiting the http://ipaddressofpihole/admin should display a admin interface when accessing from within the network OR 127.0.0.1/admin on localhost
Actual Behaviour:
I get an ERR_CONNECTION_REFUSED even when on the localhost.
Seems Pi-hole's web server lighttpd is not running:
*** [ DIAGNOSING ]: lighttpd version
[✗] lighttpd version could not be detected.
*** [ DIAGNOSING ]: Pi-hole processes
[✗] lighttpd daemon is failed
[✓] pihole-FTL daemon is active
What's the output of the following commands;
which lighttpd
sudo systemctl status --full --no-pager lighttpd.service