Phusion Passenger is currently not serving any applications

See my comment here.

You need to explicitly specify, where actual Ruby code of a Rails application is located, using passenger_app_root directive, described in Passenger's documentaion.

Without this directive, Passenger will thinck, that actual Ruby code is located in path, specified with root nginx-directive.

Example of a correct configuration file '/etc/nginx/sites-available/app_name':

server {  listen 80;  server_name 188.225.35.216;  passenger_enabled on;  rails_env    production;  root         /path/to/your/app/public/folder;  passenger_app_root /path/to/your/app/code; # <<< Point Passenger to application code  # redirect server error pages to the static page /50x.html  error_page   500 502 503 504  /50x.html;  location = /50x.html {    root   html;  }}

In my case, Passenger was't serving my Rails app, that was deployed with Capistrano.I had have to specify a value for passenger_app_root like following /var/www/my_app/current.

This will point Passenger exactly, where application code is presented.

I am betting your passenger is running.
If you look at step 3, it hints at what I am talking about.

https://www.phusionpassenger.com/library/install/nginx/install/oss/trusty/

Nginx will take care of passenger for you if it's set up to do that.Can you try the command in that tutorial and look for passenger processes too ?

sudo /usr/sbin/passenger-memory-stats

Good luck!