Question

Nginx 502 Bad Gateway and Node.JS app

Posted March 18, 2014 141.1k views
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. 
[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"
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: 
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";

    }

}
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15 answers
bigbassroller April 13, 2015

I was having this same issue with running multiple apps/websites on one server along with node.js app running on port 3000.

It turned out to be SELinux permission issue and solved by running this command:
sudo semanage port –add –type httpportt –proto tcp 3000

Hope this helps anyone having the same problem.

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finid March 19, 2014
Posting this configs hoping that somebody else will spot something that I'm missing:

This is the Nginx config from forum.example.com under sites-available directory, which is properly linked to sites-enabled directory 


#

server {

    server_name forum.example.com www.forum.example.com;

    

    listen 8080;



## Settings for proxying Node.JS forum installation.



        location / {



        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/;

        proxy_redirect off;



        # Socket.IO Support

        proxy_http_version 1.1;

        proxy_set_header Upgrade $http_upgrade;

        proxy_set_header Connection "upgrade";



    }



}


And below are the settings from the apps config file: 


{

    "base_url": "http://127.0.0.1",

    "port": "4567",

    "use_port": true,

    "secret": "secret",

    "bind_address": "0.0.0.0",

    "database": "redis",

    "redis": {

        "host": "127.0.0.1",

        "port": "6379",

        "password": "secret2",

        "database": "0"

    },

    "bcrypt_rounds": 12,

    "upload_path": "/public/uploads",

    "relative_path": ""

}


Now if I attempt to access the app from forum.example.com, I get: 


[error] 9921#0: *148 connect() failed (111: Connection refused) while connecting to upstream, client: 127.0.0.1, server: forum.example.com, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:4567/", host: "forum.example.com"


which is just the same error I get if I try to access it from a subfolder.

Any clues?
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nnlolz June 2, 2018

I had similar issue and spent a some time on it fugiuring out why it happened and the thing was, that I simply forgot to do npm install, because one of the core dependencies wasn’t installed on the server. What a shame…

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nodegraphqlman August 16, 2018

With node/nginx proxy and ajax requests get 502:

I fixed this issue by simply stopping and starting pm2 and ensuring only 1 pm2 process was running.

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finid March 19, 2014
As you can see from the config, the Node.JS app is running on port 4567, which is different from the Nginx port, running on a www port.

The Node.JS application is started using Forever - "forever start app.js".

The thing is, without Nginx, I can access the app using the IP/URL of the main site and the Node apps port, like this: http://example.com:4567.

But not via Nginx.
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kamaln7 March 30, 2014
"502 Bad Gateway" means that NodeJS is not running. Make sure your NodeJS app is running.
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Dsalcedo March 19, 2014
you need run the node proyect:

/home/test/nodejs/
>node server.js

Remember: nodejs need run in diferent port at nginx.
How to node: http://nodejs.org/
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sleepdreaming March 19, 2014
Is your application serving 127.0.0.1:4567/forum or JUST 127.0.0.1:4567?

The way I see it, you're probably serving it on 127.0.0.1:4567 and want to pass it to nginx on example.com/forum

Removing the /forum from 127.0.0.1:4567/forum might help.
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finid March 19, 2014
I have actually tried that, but still get the same result. Matter of fact, I have also tried accessing the application via a subdomain, after making the necessary changes, but still getting just about the same error, which is,


014/03/18 23:19:26 [error] 9921#0: *148 connect() failed (111: Connection refused) while connecting to upstream, client: 127.0.0.1, server: forum.example.com, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:4567/", host: "forum.example.com"


You can see from the above error that the app is being served at http://127.0.0.1:4567

The only difference between mine and other setups I've come across is that Nginx is sitting behind Varnish (Varnish[port 80] > Nginx[port 8080]. But I don't see that as an issue because the main site is working well.
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finid March 19, 2014
And on the browser, the error is still "502 Bad Gateway."

Btw, I running Nginx 1.4.6
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