Good afternoon, I have a question or rather I need urgent help, can you create and run several certificates on the same IP and server ??? Everything works for me but with a certificate I want to install another one, my operating system is Windows Server
Welcome to the Let's Encrypt Community 
You absolutely can (even over the same port). That's what SNI is for.
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what's your Server version?
If you use Windows 2008, that's too old, SNI is not supported. With Windows 2012, it's possible.
With Windows 2008, you would need one certificate with all domain names.
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That's an excellent clarification, @JuergenAuer.
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