Instance Status Check Failed and Server not Running
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An EC2 instance suddenly stopped working, even though we did not change anything on the server. The website hosted on the server is no longer accessible. Also, we cannot connect to the server via SSH or with the EC2 instance connection from AWS. When we restart the instance, the instance status is "Running", the system check is successful, but the instance status check failed. When we try to connect to the server via SSH, we get a connection timeout on port 22. 
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Hi, in case you do not change anything on your instance, check network configuration:
- Internet gateway is attached to VPC you are using to deploy instance
- (Most common case) It does not have inbound/outbound for security group
- Check NACL configuration is okay
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All the Above said things are fine. But the issue still persists.