Error 4003: can't ssh login into the instance that I created in google cloud platform

Question

I am using GCP and I created a vm instance, but I can't ssh into the machine. This is the error I am getting:

Connection via Cloud Identity-Aware Proxy Failed Code: 4003 Reason: failed to connect to backend

As I search it is because of This might mean the instance isn't listening on the port you're trying to connect to or the firewall is closed.

Here is my firewall config:

Answer 1

This may not be a complete answer, but at the very least your firewall rules aren't allowing connections on the SSH port. There should be an ingress rule to allow traffic to the instance on TCP port 22 (SSH) on that VPC network.

Generally, this is automatically created by GCP, on the default network it is typically called "default-allow-ssh", but you can also manually create it in the VPC Network -> Firewall rules tab. Make sure it applies to the instance in question (either through "All targets" or a target tag that matches the instance). You can read more about GCP firewall rules in the documentation.

Likewise, make sure you have an external IP or that you are following one of the options described here.