Nginx 502 Bad Gateway and Node.JS app

Folks,

I’m trying to install a Node.JS application in a subfolder of a WordPress site running on Nginx, Varnish and php-fpm.

Any attempt to access the site gives a 502 Bad Gateway browser error and the following message in Nginx’s error log.

<pre> [error] 20247#0: *143 connect() failed (111: Connection refused) while connecting to upstream, client: 127.0.0.1, server: example.com, request: “GET /forum HTTP/1.1”, upstream: “http://127.0.0.1:4567/forum”, host: “example.com” </pre>

I’ve researched the cause of such error messages, but have yet to come up with a solution. It it helps, here’s my Nginx config:

<pre> server {

server_name example.com www.example.com;
  
root /home/public_html/;
listen 8080;
 
index index.html index.htm index.php;

include conf.d/drop;

    location / {
            
        try_files $uri $uri/ /index.php?q=$uri&$args;
    }

    location ~ \.php$ {
        fastcgi_buffers 8 256k;
        fastcgi_buffer_size 128k;
        fastcgi_intercept_errors on;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_pass unix:/var/run/php5-fpm.sock;


    }

    location ~* \.(css|js|png|jpg|jpeg|gif|ico)$ {
            expires 1d;
    }

Settings for proxying NodeBB forum installation. Added March 14 2014.

    location ^~ /forum {

    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_set_header X-NginX-Proxy true;

    proxy_pass http://127.0.0.1:4567/forum;
    proxy_redirect off;

    # Socket.IO Support
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";

}

} </pre>