Passenger + NGINX: Phusion Passenger is currently not serving any applications - ruby-on-rails

Question

Phusion Passenger + NGINX in production environment
I have done everything as usual with my ROR-application, but passenger not working with it. Have no idea whats wrong...
sudo passenger-config restart-app
Phusion Passenger is currently not serving any applications.
/etc/nginx/sites-available/myapp
server {
listen 80;
server_name _;
# Tell Nginx and Passenger where your app's 'public' directory is
root /var/www/myapp/public;
passenger_app_root /var/www/myapp;
rails_env production;
passenger_enabled on;
passenger_ruby /home/myuserapp/.rvm/gems/ruby-2.3.1/wrappers/ruby;
}
In sites-enabled have a soft symlink myapp to /etc/nginx/sites-available/myapp
sudo passenger-status
Version : 5.1.4
Date : 2017-05-25 06:56:30 +0300
Instance: byXevAbZ (nginx/1.10.3 Phusion_Passenger/5.1.4)
----------- General information -----------
Max pool size : 6
App groups : 0
Processes : 0
Requests in top-level queue : 0
----------- Application groups -----------
But have some passenger instances running...
sudo passenger-config list-instances
Name PID Description
--------------------------------------------------------------------------
byXevAbZ 1085 nginx/1.10.3 Phusion_Passenger/5.1.4

Answer 1

I ran sudo nginx -t command
nginx: [warn] conflicting server name "_" on 0.0.0.0:80, ignored
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
First warning cofused me, so i decide the problem is in conflict myapp-site and defult one.
So i just turn of default site and restart nginx. And everything worked!
sudo rm /etc/nginx/sites-enabled/default
sudo service nginx restart
Final config file:
/etc/nginx/sites-available/myapp
server {
listen 80;
server_name myapp.com;
# Tell Nginx and Passenger where your app's 'public' directory is
root /var/www/myapp/current/public;
rails_env production;
# Turn on Passenger
passenger_enabled on;
passenger_ruby /home/myuserapp/.rvm/gems/ruby-2.3.1/wrappers/ruby;
}
P.S. Correct me if you understand the subject deeper.