why you deleted a corrupted VM instance in AWS and recreated it from a previous snapshot. But, your SSH connection fails with error "ssh: connect to port 22: Connection refused" though you copied the key file to the new VM.

Identify one thing that could cause this issue.

Describe how you could confirm you have found the cause (e.g. a command to run).

Describe how you would resolve this problem. For this step, you may assume you have identified and proved the correct cause of the problem.