Add section before section 7 with "Edit /etc/nginx/nginx.conf to contain the following in the http section: 
gzip            on;
gzip_min_length 1000;
gzip_proxied    expired no-cache no-store private auth;
gzip_types      text/plain application/xml application/json application/javascript application/octet-stream text/css;
include /etc/nginx/conf.d/*.conf;
"

This modification makes the Web Interface working with NGINX.

(This is my first contribution to GitHub, so I hope the formatting is okay).

Updated to correct numbering