thx. see below. Both (server + client) are in the same network...
error.log 2018/12/06 07:06:37 [error] 386#386: *25 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 192.168.1.179, server: _, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/run/php/php7.1-fpm.sock", host: "192.168.1.121:8443", referrer: "http://192.168.1.121/Docker"
access.log 192.168.1.179 - - [06/Dec/2018:07:06:37 +0100] "GET / HTTP/1.1" 504 569 "http://192.168.1.121/Docker" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36"
cracksilver