Which step should be taken to troubleshoot this issue?
Ensure that the database option group for the RDS DB instance allows ingress from the Developer machine’s IP address
Ensure that the RDS DB instance’s subnet group includes a public subnet to allow the Developer to connect
Ensure that the RDS DB instance has not reached its maximum connections limit
Ensure that the connection is using SSL and is addressing the port where the RDS DB instance is listening for encrypted connections
Explanations:
The error is related to a communications link failure, which is unlikely to be caused by IP address restrictions. The issue is more likely to be with the encryption settings.
The subnet group configuration does not directly relate to SSL encryption requirements. The issue is more likely to be related to ensuring encrypted connections rather than network routing.
Reaching the maximum connections limit would result in a different type of error, such as too many connections, rather than a communications link failure.
Since the company requires encryption in transit, ensuring that the connection uses SSL and addresses the correct port for encrypted connections is essential for solving the link failure issue.
As far as I’m aware, the answer is:
Ensure that the connection is using SSL and is addressing the port where the RDS DB instance is listening for encrypted connections