title: Cloud NAT configuration failure?
body: <p>I have configured Cloud Nat (in GCP). An application (installed as a Docker Container in a cOS Machine) without External IP receive a request (from load balancer) which execute a PHP controller to send data (to an external server) using a HTTPS request.</p>
  <p>We receive a 502 response. However if we activate the external IP (in cOS Host Machine) we receive a successful response. What am I doing wrong? How can I solve it? I require to use CloudNat.</p>