NPM common issue , for solving this use add swap 
@raul said:
@a_5mith are you running nodebb on port 80, without that you would need to pass the nodebb port 4567 for the nginx proxy to work, wouldn't it?
Yes. that is correct. We pass in the port (or rather, we specify the proxy_pass value directly😞
proxy_pass http://127.0.0.1:4567/;
