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Hi There . I would check the system log first and see if there is anything of interest.
To get console output
- Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/
- In the left navigation pane, choose Instances, and select the instance.
- Choose Actions, Monitor and troubleshoot, Get system log.
Please see https://aws.amazon.com/premiumsupport/knowledge-center/ec2-linux-status-check-failure/ for a list of troubleshooting steps
- Determine if the instance status check or system status check failed by viewing the instance status check metrics.
- If the system status check failed, then see My instance failed the system status check. How do I troubleshoot this?
If the instance status check failed, then check the instance's system logs to determine the cause of the failure. Depending on the data found in the system logs, use one of the following resolutions:
It's aws checks on the host and instance so you shouldn't worry about debugging the issue. Try to spin it on another host by doing stop then start it again may solve the issue . Restart will reproduce the same issue because instance doesn't start on different host . Also if it's custom Ami make sure it had no problem like a system configurations prevent the system to boot properly.