I am on ISPConfig 3.1 beta, debian 8 + nginx. No apache. I am trying to install a magento store, using the official magento's configuration file for nginx (github.com/magento/magento2/blob/develop/nginx.conf.sample). But obviously, when I enter it in the ispconfig interface, it doesn't use it because it's not correct to include a full configuration in another one (since ispconfig copy/paste the lines in its own generated configuration file). I forced the vhost.err to be loaded to check the mistakes with a "systemctl status nginx.service". It first told me that I had 2 root directives, so I commented the magento's one to test, but then it told me "nginx: [emerg] no port in upstream « fastcgi_backend » in /etc/nginx/sites-enabled/100-sofa-chic.fr.vhost:121".
I have no idea how to fix it, would someone have any clue please?