Im Log habe ich folgendes gefunden:
Oct 19 22:08:12 s1 nginx: 2021/10/19 22:08:12 [error] 7936#7936: *280274 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 192.168.2.111, server: , request: "POST /plugins/community.applications/include/exec.php HTTP/2.0", upstream: "fastcgi://unix:/var/run/php5-fpm.sock", host: "s1.local", referrer: "https://s1.local/Apps"