title: Error configuring nginx to point to the Jenkins server
body: <p>I have got Jenkins running on a CentOS 7 VM with IP say <code>129.215.193.34</code>. So, I can access Jenkins using <code>129.215.193.34:8080</code>. I wanted to uses <code>nginx</code> so users don't have to type <code>:8080</code> and just the IP number. 
  After installing nginx and inserting the following in /etc/nginx/nginx.conf</p>
  
  <pre><code>location / {
      proxy_pass http://127.0.0.1:8080;
      proxy_redirect off;
      proxy_set_header Host $host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto $scheme;
  }
  </code></pre>
  
  <p>But I am getting a generic error when accessing to <code>129.215.193.34</code>. How can I know what is wrong here? I can see Jenkins web interface on <code>129.215.193.34:8080</code> but nothing on just <code>129.215.193.34</code></p>
  
  <p>The rest of the <code>nginx.conf</code> looks like this</p>
  
  <pre><code>user nginx;
  worker_processes auto;
  error_log /var/log/nginx/error.log;
  pid /run/nginx.pid;
  
  # Load dynamic modules. See /usr/share/nginx/README.dynamic.
  include /usr/share/nginx/modules/*.conf;
  
  events {
      worker_connections 1024;
  }
  
  http {
      log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                        '$status $body_bytes_sent "$http_referer" '
                        '"$http_user_agent" "$http_x_forwarded_for"';
  
      access_log  /var/log/nginx/access.log  main;
  
      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;
  
      # Load modular configuration files from the /etc/nginx/conf.d directory.
      # See http://nginx.org/en/docs/ngx_core_module.html#include
      # for more information.
      include /etc/nginx/conf.d/*.conf;
  
      server {
          listen       80 default_server;
          listen       [::]:80 default_server;
          server_name  _;
          root         /usr/share/nginx/html;
  
          # Load configuration files for the default server block.
          include /etc/nginx/default.d/*.conf;
          location / {
             sendfile off;
             proxy_pass         http://127.0.0.1:8080;
             proxy_redirect     default;
  
             proxy_redirect off;
             proxy_set_header Host $host;
             proxy_set_header X-Real-IP $remote_addr;
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
             proxy_set_header X-Forwarded-Proto $scheme;
          }
  
      error_page 404 /404.html;
          location = /40x.html {
      }
  
      error_page 500 502 503 504 /50x.html;
          location = /50x.html {
      }
  }
  </code></pre>