Oh, and here is my full nginx.conf contents:

error_log logs/error.log;
worker_processes 1;
events {
worker_connections 1024;
}

http {
include mime.types;
default_type application/octet-stream;

upstream mysite {
server 127.0.0.1:4004;
}
server {
#note: not actual IP
listen 111.222.333.444:80;
server_name _;
return 444;
}
server {
#note: not actual IP
listen 111.222.333.444:80;
server_name new.mysite.co.uk;
root ../rails/MySite/public;

location / {
try_files $uri @rails;
}

location @rails {
proxy_pass http://mysite$request_uri;
}

proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
}

Grateful for any help!

JS