Puma and Nginx 502 Bad Gateway error (Ubuntu Server 14.04)
<p>I need to deploy my rails application,So I have followed all step from here, <a href="https://www.digitalocean.com/community/tutorials/how-to-deploy-a-rails-app-with-puma-and-nginx-on-ubuntu-14-04" rel="noreferrer">https://www.digitalocean.com/community/tutorials/how-to-deploy-a-rails-app-with-puma-and-nginx-on-ubuntu-14-04</a></p>

<p>But end of the tutorial, I get this error --> "502 Bad Gateway"</p>

<p><strong>EDIT</strong><br>
The error message now --> "We're sorry, but something went wrong."<br>
But Nginx error output is the same, I check puma error messages but they just log when it start and when it stop gracefully.</p>

<p>Rails logs which is under app_directory/log   does not produce any output.<br>
puma-manager --> I checked it works correctly<br>
paths       ---> I have checked three times </p>

<p>Nginx error.log output message:   </p>

<pre><code>2016/05/18 14:22:21 [crit] 1099#0: *7 connect() to unix:/home/deploy   /hotel-automata/shared/sockets/puma.sock failed (2: No such file or directory) while connecting to upstream, client: 192.168.2.105, server: localhost, request: "GET /favicon.ico HTTP/1.1", upstream: "http://unix:/home/deploy/hotel-automata/shared/sockets/puma.sock:/500.html", host: "192.168.2.170"
</code></pre>

<p>OS -> Vmware Player, Bridged Network Ubuntu Server 14.0.4<br>
Ruby Version: 2.3.1<br>
Rails Version: 4.2.5.2</p>

<p>This is my nginx config contents of  /etc/nginx/sites-available/default</p>

<pre><code>upstream app {
# Path to Puma SOCK file, as defined previously
server unix:/home/deploy/hotel-automata/shared/sockets/puma.sock fail_timeout=0;
}

server {
listen 80;
server_name localhost;

root /home/deploy/hotel-automata/public;

try_files $uri/index.html $uri @app;

location @app {
    proxy_pass http://app;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
}

error_page 500 502 503 504 /500.html;
client_max_body_size 4G;
keepalive_timeout 10;
}
</code></pre>