Plesk domain served by CloudFlare shows 522 error Connection Timed Out

Symptoms

• A website example.com that is hosted on a Plesk server and uses the Cloudflare nameservers (and has its primary DNS zone on the side of Cloudflare) displays the following error when opened in a browser:
  

  CONFIG_TEXT: 522 error
  Connection Timed Out

  or:

  CONFIG_TEXT: ERR_CONNECTION_TIMED_OUT

• The website is either opening normally when resolved to a Plesk IP in the hosts file (without CloudFlare involved into processing the request) or is only showing an SSL warning that is similar to the following:
  

  CONFIG_TEXT: Your connection is not private
  This server could not prove that it is example.com; it's security certificate is not trusted 

Cause

The current configuration on the end of Cloudflare for this domain blocks connections to sites with untrusted SSL. Alternatively, the domain's DNS records within the Cloudflare DNS zone are set up incorrectly (for example, one of the A records points to an IP that is not the IP of the Plesk server)

Resolution

Contact CloudFlare support for assistance with the manual configuration that has been done on the their end.

Alternatively, apply one of the following solutions:

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