Hi!

I have been researching and trying out many different ways to kill my 502 Bad Gateway but to no success!

Domain Registrar:
GoDaddy.
My normal home web-page's domain is mydomain.com which forwards to an instapage website, but I have a subdomain login.mydomain.com to redirect (301) to my DO droplet. Added an A record for login that points to the DO IP.

Deploying Meteor
I follow the this guide https://www.digitalocean.com/community/tutorials/how-to-deploy-a-meteor-js-application-on-ubuntu-14-04-with-nginx where I run "sudo npm install" while being the myapp user.

My /etc/nginx/sites-available/myapp.conf file:

server_tokens off;
map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
}
server {
    listen 80 default_server; 
    listen [::]:80 default_server ipv6only=on;

    root /usr/share/nginx/html; # root is irrelevant
    index index.html index.htm; # this is also irrelevant

    server_name login.mydomain.com;
    location / {
        rewrite     ^ https://$server_name$request_uri? permanent;
    }
}
server {
    listen 443 ssl spdy;
    server_name login.mydomain.com;
    root html;
    index index.html;

    ssl_certificate /etc/nginx/ssl/server.pem;
    ssl_certificate_key /etc/nginx/ssl/server.key;

    ssl_stapling on;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 5m;

    ssl_prefer_server_ciphers on;
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:ECDHE-RSA-RC4-SHA:ECDHE-ECDSA-RC4-SHA:RC4-SHA:HIGH:!aNULL:!eNULL:!EXPORT:!DES:!3DES:!MD5:!PSK';

    add_header Strict-Transport-Security "max-age=31536000;";
    if ($http_user_agent ~ "MSIE" ) {
        return 303 https://browser-update.org/update.html;
    }
    location / {
        proxy_pass http://127.0.0.1:8080;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade; # allow websockets
        proxy_set_header Connection $connection_upgrade;
        proxy_set_header X-Forwarded-For $remote_addr; # preserve client IP
        if ($uri != '/') {
            expires 30d;
        }
    }
}

My /etc/init/myapp.conf file:

description "Meteor.js (NodeJS) application"
author "Daniel Speichert <daniel@speichert.pro>"
start on started mongodb and runlevel [2345]
stop on shutdown
respawn
respawn limit 10 5
setuid myapp
setgid myapp

script
    export PATH=/opt/local/bin:/opt/local/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
    export NODE_PATH=/usr/lib/nodejs:/usr/lib/node_modules:/usr/share/javascript
    export PWD=/home/myapp
    export HOME=/home/myapp
    export BIND_IP=127.0.0.1
    export PORT=8080
    export HTTP_FORWARDED_COUNT=1
    export MONGO_URL=mongodb://localhost:27017/myapp
    export ROOT_URL=https://login.mydomain.com
    exec node /home/myapp/bundle/main.js >> /home/myapp/myapp.log
end script

NOTES

• My DO is Ubuntu 14.04 x64
• the names mydomain and myapp are not the same if that matters
• I set-up SSL exactly like this: https://www.digitalocean.com/community/tutorials/how-to-create-a-ssl-certificate-on-nginx-for-ubuntu-12-04
• When I run "start myapp" it says "myapp start/running, process 12218" and when I type "status myapp" it then shows "myapp stop/waiting".
• NGINX is running.
• /home/myapp/myapp.log is empty so somehow the Meteor app doesn't see any errors.
• "nginx -t" returns all OK except SSL stapling warning
• My NGINX error log says 2016/05/04 00:30:42 [error] 18144#0: *28 connect() failed (111: Connection refused) while connecting to upstream, client: <IP ADDRESS>, server: login.mydomain.com, request: "GET /favicon.ico HTTP/1.1", upstream: "http://127.0.0.1:8080/favicon.ico", host: "login.mydomain.com", referrer: "https://login.mydomain.com/"
• My code runs on my localhost just fine on my dev laptop (Mac OS).
• I cannot access it on <IP ADDRESS>:8080 so it seems it just can't reach Meteor on the server.
• "sudo netstat -plutn" output: tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 12209/nginx
  tcp 0 0 127.0.0.1:28017 0.0.0.0:* LISTEN 2880/mongod
  tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1103/sshd
  tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN 12209/nginx
  tcp 0 0 127.0.0.1:27017 0.0.0.0:* LISTEN 2880/mongod
  tcp6 0 0 :::80 :::* LISTEN 12209/nginx
  tcp6 0 0 :::22 :::* LISTEN 1103/sshd
  

Anybody any idea why there's still a 502 Bad Gateway issue?