Despite a lot of searching, I've not found my issue listed anywhere, so here goes.
Setting this up, DNS of a spare URL I own is pointed at digital ocean vps, added the server settings (attached below) into sites-available, this is then symlinked into sites-enabled. Have changed config.json of nodebb to not use port 4567, restarted nginx nodebb and the server.
Can still only access the site if I use the port.
Contents of default
server {
listen 0.0.0.0:80;
server_name site.info;
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 the contents of config.json
{
"base_url": "http://site.info",
"port": "4567",
"use_port": false,
"secret": "shhh",
"bind_address": "0.0.0.0",
"database": "redis",
"redis": {
"host": "127.0.0.1",
"port": "6379",
"password": "also shhhh",
"database": "0"
},
"bcrypt_rounds": 12,
"upload_path": "/public/uploads",
"relative_path": ""
}
Can I also clarify that when I created the symlink inside sites-enabled, it's made the file structure sites-enabled/sites-available/
but sites-available is a fancy blue in colour.
Running nginx -t
gives me this:
nginx: [emerg] open() "/etc/nginx/mime.types" failed (2: No such file or directory) in /etc/nginx/nginx.conf:26
nginx: configuration file /etc/nginx/nginx.conf
Halp... 
Oh and nginx -v
== 1.6.0