Website hosted on Plesk server is not accessible via HTTPS: This site can’t be reached

Dmitry Bystrov

10 months ago

Symptoms

A website hosted on a Plesk server is not accessible via HTTPS:

Server not found

Could not locate remote server

This page can’t be displayed

This site can’t be reached
Web Server's Default Page may be shown instead of the site's content.
The Let's Encrypt certificate can not be issued for the domain in Domains > example.com > SSL/TLS Certificates with the following error:
Could not issue an SSL/TLS certificate for example.com Details Could not issue a Let's Encrypt SSL/TLS certificate for example.com Details No domains have passed validation
The website works properly over HTTP or redirects to HTTPS:

# curl -I http://example.com/ -v
* About to connect() to www.example.com port 80 (0)
* Trying 203.0.113.2... connected
.........
< Location: https://example.com/
Location: https://example.com/

.

SSL/TLS support option is disabled for the domain but a redirection to HTTPS might have been enabled in the website configuration/code.

Log in to Plesk.
Go to Domains > example.com > Hosting Settings and enable the option SSL/TLS support:

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