node.js app with nginx 502 bad gateway error

Question

i am configuring my node.js app with nginx. It is working fine for http but it is not working for https. When i try to access secure domain. i get this error.

502 Bad Gateway
nginx/1.4.6 (Ubuntu)

Here is my nginx conf file

    upstream node_app_dev {
        server 127.0.0.1:3000;
    }

    upstream node_app_production {
        server 127.0.0.1:3000;
    }

server {
    listen 80;
    server_name mydomain.com;
    access_log /var/log/nginx/dev.log;
    error_log /var/log/nginx/dev.error.log debug;

    location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarder-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_pass http://node_app_dev;
        proxy_redirect off;
    }
}


server {
    listen 443 ssl;
    server_name mydomain.com;
    access_log /var/log/nginx/secure.log;
    error_log /var/log/nginx/secure.error.log debug;    

    ssl on;
    ssl_certificate certs/mycert.crt;
    ssl_certificate_key certs/mykey.key;

    location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarder-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $host;        
        proxy_pass https://node_app_production;
        proxy_redirect off;

    }    
}

Possible duplicate of http://stackoverflow.com/questions/10375659/nginx-proxy-pass-node-ssl : If you're using nginx to handle SSL, then your node server will just be using http. — jpaljasma, Oct 23 '15 at 01:36
my node.js server is simple http server. i am handling https with nginx and it is pointing to simple http server. — mabc224, Oct 23 '15 at 01:48
I am glad it worked out for you. Would you be willing to up vote my answer? — jpaljasma, Oct 23 '15 at 01:55

score 18 · Accepted Answer · edited May 23 '17 at 12:32

18

Replace

proxy_pass https://node_app_production;

with

proxy_pass http://node_app_production;

Restart the nginx and you should be all set. See nginx proxy pass Node, SSL?

edited May 23 '17 at 12:32

Community

1
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answered Oct 23 '15 at 01:49

jpaljasma

1,612
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1

Copy pasted location setting from previous file without noticing https. :) – Zeni Apr 26 '19 at 09:46

Denis Wang · Answer 2 · 2019-09-13T09:48:25.317

I've resolved the issue with 2 steps.

Check /var/log/nginx/error.log

connect() failed (111: Connection refused) while connecting to upstream, client: *.*.*.*, server: *.*.*.*, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "*.*.*.*"

Upstream was still 127.0.0.1:8000 even if I set upstream to 127.0.0.1:3000 in nginx conf file.

Replace server 127.0.0.1:8000 with server 127.0.0.1:3000 in /etc/nginx/conf.d/virtual.conf and restart nginx.

server {
    listen       80;
    server_name  SERVER_IP_ADDRESS;

    location / {
        proxy_pass http://127.0.0.1:3000;
    }
}

sudo /etc/init.d/nginx restart

Finally, it works with no 502 error.

node.js app with nginx 502 bad gateway error

2 Answers2