Solved. Cloudflare was the problem.

@pichalite "Server not found"

The Subdomain exists and is pointing to the nodebb forum with an A record.

@pichalite said in Setup NGINX + NodeBB on a subdomain:

our IP:4567;

Still no changes

@pichalite Yes I can Access it and everything gets displayed as it should

Thanks for the fast reply!

When I open the subdomain I see nothing at all.
Here is a part of my nginx.conf:

 http {
    upstream nodebb {
     server IP:4567;
    }
}

And here is the sites-available File:

  server {
    listen 80;
    #listen [::]:80 default_server ipv6only=on;

    root /var/www/FORUMNAME/forums;
    index index.html index.htm;

    # Make site accessible from http://localhost/
    server_name community.FORUMNAME.us;
    location / {
            # First attempt to serve request as file, then
            # as directory, then fall back to displaying a 404.
            # try_files $uri $uri/ =404;
            # Uncomment to enable naxsi on this location
            # include /etc/nginx/naxsi.rules
            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://nodebb;
            proxy_redirect off;

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


    }

( i replaced the original ip with IP and the forum name with FORUMNAME.)

Anything wrong with that setup?

I was following this tutorial: http://www.blogsynthesis.com/nginx-as-nodebb-proxy/

NodeBB is running, nginx is running.
I did EXACTLY everything described there, but still the subdomain wont show up the NodeBB forums.

What i did:
Followed the tutorial step by step
Setup subdomain on my hoster
Point the A record of the subdomain to the digital ocean droplet( forum)

Any help?