Failed to connect to your instance EC2 Instance Connect is unable to connect to your instance.

Question

The 3cx system is down al week. W can not login to the manager console. When we try to reboote the system ant connest we got this message al the time:
Failed to connect to your instance
EC2 Instance Connect is unable to connect to your instance. Ensure your instance network settings are configured correctly for EC2 Instance Connect. For more information, see EC2 Instance Connect Prerequisites at https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-connect-prerequisites.html.

What it the problem?

Ouer server is on the Amazon cloud. Nothing has been changed. Last sunday it showed problems with connection.
Desperatly need some help to solve this  problem.

Answer

Hello.

Was your EC2 originally able to connect using EC2 Instance Connect?  
If so, please follow the steps in the document below to check the system logs, etc. to see if any errors have occurred.  
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/troubleshoot-unreachable-instance.html#instance-console-console-output

Also, the following document describes the prerequisites for using EC2 Instance Connect, so please make sure you have met all of them.  
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-connect-prerequisites.html

Please also check the following documents for troubleshooting instructions.  
https://repost.aws/knowledge-center/ec2-instance-connect-troubleshooting

Failed to connect to your instance EC2 Instance Connect is unable to connect to your instance.

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