@puresick If I may ask this, what does fast_cgi really do? I don't get it. I've seen it mentioned so much but I've not had to deal with it since I left PHP a long time ago (but still have to dabble in it now and then).
@celia I do not know exactly what it does either. :D
What I know is that it handles the interpretation of PHP in an efficient and fast way when some .php gets requested via the webserver. That is what CGI is for generally: Having an interface between a webserver and some program handling stuff.
I often stumble upon this configuring something selfhosted - yesterday it was after a pihole update resulting in its admin interface not working anymore.