Connecting to DocumentDB from outside the VPC does not work with AWS Linux 2023 tunnel

Question

I have in the past successfully set up a connection to DocumentDB using Studio 3T. I have basically followed these instructions:

https://docs.aws.amazon.com/documentdb/latest/developerguide/studio3t.html

Previously I have used AWS Linux 2 as my EC2 tunnel to access the database. However recently I tried with AWS Linux 2023 and Studio 3T fails to connect.  It gives the error message

SSH Tunnel error: SSH tunnel could not be created to ANY server.

As soon as I use a Linux 2 EC2 machine (with all the other settings the same) it works fine.

What do I need to do to the AWS Linux 2023 machine to make it work?

Answer

Hello.

Is SSH allowed in security groups in EC2?  
Is the key pair set for EC2 correct?  
Also, do you allow access from EC2 in the DocumentDB security group?

Connecting to DocumentDB from outside the VPC does not work with AWS Linux 2023 tunnel

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