Hi sir ,
As a part of trouble shooting activity first can you check the EC2 is in running state and health check is passed . Another view is once you restarted the EC2 instance your public IP address might changed verify it. in case you are not using the elastic IP for the instance.
Another possibilities is check you are using the right key configured with the instance.
when its come to service Jenkins verify the service is up and running .
Our ssh connections broke too yesterday. seems something changed 1st March ?
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