Allow Let's Encrypt to validate over 80 or 443 (not just 80)
We're very excited to see Let's Encrypt in Plesk 17, it makes secure sites much, much easier. However, port 80 is not open on a number of our servers for security reasons and it would appear the Plesk coding for the API to Let's Encrypt forces the use of port 80. Let's Encrypt supports validation of domains over 80 OR 443, but Plesk is requiring 80. The only workaround is to open 80 to the world so it can be validated since Let's Encrypt does supply a list of public IP's their traffic could source from.
Robbie
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Everyone, we are closing the current request since it looks invalid. According to the Let's Encrypt documentation,
"The HTTP-01 challenge can only be done on port 80. Allowing clients to specify arbitrary ports would make the challenge less secure, and so it is not allowed by the ACME standard."
— AY