Site port protect?

Hello, my site working 443 port so https

but different server-site 443 port connect my content stealing.

VestaCP firewall added thief site ip added block possibly but more sites appear.

block after thief site this error show

Failed to connect to mysiteadress.com port 443: Connection refused

Code (markup):

How can i prevent it?

I want to do 443 port only works my domain.

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