Make sure that you have specified all VPC endpoint for SSM:
- com.amazonaws.region.ssm: The endpoint for the Systems Manager service.
- com.amazonaws.region.ec2messages: Systems Manager uses this endpoint to make calls from SSM Agent to the Systems Manager service.
- com.amazonaws.region.ec2: If you're using Systems Manager to create VSS-enabled snapshots, you need to ensure that you have an endpoint to the EC2 service. Without the EC2 endpoint defined, a call to enumerate attached EBS volumes fails, which causes the Systems Manager command to fail. - com.amazonaws.region.ssmmessages: This endpoint is required only if you are connecting to your instances through a secure data channel using Session Manager. For more information, see AWS Systems Manager Session Manager.
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