title: nginx: [emerg] a duplicate default server
body: <p>When I try restart nginx and write in console this command </p>
  
  <blockquote>
    <p>nginx -t</p>
  </blockquote>
  
  <p>I have an error:</p>
  
  <pre><code>nginx: [emerg] a duplicate default server for 0.0.0.0:80 in /etc/nginx/sites-enabled/default.save:20
  nginx: configuration file /etc/nginx/nginx.conf test failed
  </code></pre>
  
  <hr>
  
  <p><em>sites-enabled/default</em></p>
  
  <pre><code>server {
          listen 80 default_server;
          listen [::]:80 default_server ipv6only=on;
  
          server_name localhost;
          passenger_enabled on;
          rails_env    production;
          root         /home/hh/public;
  
          access_log  /var/log/nginx/host.access.log;
          # redirect server error pages to the static page /50x.html
          error_page   500 502 503 504  /50x.html;
          location = /50x.html {
              root   html;
          }
  }
  </code></pre>
  
  <p><em>nginx.conf</em></p>
  
  <pre><code>user www-data;
  worker_processes 4;
  pid /run/nginx.pid;
  
  events {
          worker_connections 768;
  }
  
  http {
  
          sendfile on;
          tcp_nopush on;
          tcp_nodelay on;
          keepalive_timeout 65;
          types_hash_max_size 2048;
  
          include /etc/nginx/mime.types;
          default_type application/octet-stream;
  
  
          access_log /var/log/nginx/access.log;
          error_log /var/log/nginx/error.log;
  
          include /etc/nginx/conf.d/*.conf;
          include /etc/nginx/sites-enabled/*;
  }
  </code></pre>
  
  <p>One hour ago everything worked fine, but after restart nginx I have this issue.</p>