Could not connect to /var/run/php-fpm.socket

[thebear]

Hi all

installed pfSense to my NUC7i3BNK, somehow my pfSense webGUI stops. SSH is still available, and to regain access I logon and choose number 16 -> Restart PHP-FPM

How could we find the root cause, anybody willing to help?

Jul 18 20:55:18 pfSense nginx: 2021/07/18 20:55:18 [error] 45051#100136: *794 connect() to unix:/var/run/php-fpm.socket failed (61: Connection refused) while connecting to upstream, client: 172.16.X.50, server: , request: "GET / HTTP/2.0", upstream: "fastcgi://unix:/var/run/php-fpm.socket:", host: "172.16.Y.1:8443"

Who is the upstream, and why its relevant for local mgmt?