SSL Activetion and show error

My server is running(uptime).
But when I activated SSL it gives an error.(521 Error)
What is the problem?
I have a VPS
Site Developed wth Laravel (Dedicated) is not wordpress

Error 521 Ray ID: 56cae7ee5f7b96d4 • 2020-02-29 13:15:15 UTC

Web server is down

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