Dear all ...

The above configuration (first part only needed)... was correct

This one:

server {
listen 80;
server_name DOMAIN.COM;

location / {
proxy_pass http://LAMP;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}

Just was a mistake with my DNS.

Thanks!