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Resolved Let's Encrypt issue with TLS-SNI-01

@Kirill Nikolaev

I am pretty sure it is not of importance: the Let's Encrypt Plesk extension uses the webroot approach, which is a different way of checking the challenge.

Moreover, Let's Encrypt closed the method of the TLS-SNI-01 challenge.

Regards......
 
Plesk LE extension doesn't use `TLS-SNI-01 challenge type`, therefore Plesk LE extension is not affected.
We use webroot `http-01`.
 
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