What should a SysOps administrator do to resolve this issue?
Add an inbound rule for port 22 in the security group associated with the Ubuntu instance.
Assign the AmazonSSMManagedInstanceCore managed policy to the EC2 instance profile for the Ubuntu instance.
Configure the SSM Agent to log in with a user name of “ubuntu”.
Generate a new key pair, configure Session Manager to use this new key pair, and provide the private key to the users.
Explanations:
Adding an inbound rule for port 22 is irrelevant since the issue is related to AWS Systems Manager, not SSH. The security policy prohibits SSH access.
The AmazonSSMManagedInstanceCore managed policy is required for EC2 instances to be fully managed by Systems Manager. It provides necessary permissions to the instance to communicate with Systems Manager.
The SSM Agent does not require a specific username like “ubuntu” to function. The issue is likely related to permissions or misconfiguration of the instance, not the user name.
Generating a new key pair is unnecessary because Session Manager does not require SSH key pairs. The issue is likely related to permissions or the instance not having proper SSM configuration.
I categorize that the answer is:
Assign the AmazonSSMManagedInstanceCore managed policy to the EC2 instance profile for the Ubuntu instance.