Timeout planning EC2 creation on C2S

Running “terraform plan”, hangs and I get no feedback when running on the AWS secret (IC) region. I’ve tried with different proxy settings to no avail. I am using Terraform v0.12.15 and AWS Provider v2.37.0 for Linux.

I see from the doc (https://www.terraform.io/docs/providers/aws/guides/custom-service-endpoints.html) there is hope that it would work on C2S; but, it’s not clear what is needed for EC2.

Anyone have any unclass examples for creating an EC2 on C2S?

I would also need the full list of ports involved (can’t open up everything).