Dynamic Discovery of AWS RDS databases using boundary host?

I am trying in a similar way to connect to remote Postgres DB but ending up with connection refused error.

I think boundary CLI is the only option available at the moment, hope it will be a more mature tool in the future.

In a slightly similar issue, I’m struggling to even get a connection working via the Boundary CLI.

Are there any specific encryption or security measures in place to protect data transmitted between the boundary host and the AWS RDS instances?