Nextcloud on freeNAS is not working anymore after upgrade

Hi,
i am running nextcloud (version 18) on a freeNAS box. Yesterday i upgraded freeNAS and after that nextcloud was not working anymore. When accessing nextcloud via the webbrowser i get a nginx error, at first it was 502 bad gateway and now it is ā€œinternal server errorā€.
I also checked the logs and found this in the error.log of nginx:

2020/06/01 16:54:08 [crit] 92827#102308: *31 connect() to unix:/var/run/nextcloud-php-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 192.168.178.33, server: _, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/nextcloud-php-fpm.sock:", host: "192.168.178.46"
2020/06/01 16:54:08 [crit] 92827#102308: *31 connect() to unix:/var/run/nextcloud-php-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 192.168.178.33, server: _, request: "GET /favicon.ico HTTP/1.1", upstream: "fastcgi://unix:/var/run/nextcloud-php-fpm.sock:", host: "192.168.178.46"
2020/06/01 17:05:01 [error] 21304#101913: accept4() failed (53: Software caused connection abort)

i am definitely no nginx expert so i do not know what do to here

Is your php-fpm service running?

I quit using the FreeNAS plugin a while back because it interfered with me keeping it up to date. I still run it in a jail on FreeNAS, just not as a plugin.

how do i check that?