Cloudflare ServerShield for Plesk 12 and higher uses a CNAME setup, which means that only subdomains (e.g. www.domain.com, blog.domain.com) can be pointed to Cloudflare and the authoritative DNS remains the same. Please note, ServerShield supports CNAME integration only.
For those partners who are using DNS outside of Plesk, after you have enabled Cloudflare through the ServerShield extension, the following DNS records need to be added. Please note, this configuration is designed for hosts who manage their customers' DNS.
In order to add www.domain.com to Cloudflare
Current DNS setup:
www.domain.com A Record to IP address
www.domain.com CNAME to domain.com
New DNS setup with Cloudflare requires that you add the following DNS records:
UPDATE: www.domain.com CNAME www.domain.com.cdn.cloudflare.net
[Depending on your original DNS records, whether it is CNAME or A Record, please add the following DNS record accordingly]
ADD: cloudflare-resolve-to.www.domain.com A Records to IP address.
ADD: cloudflare-resolve-to.www.domain.com CNAME domain.com
Plesk server Hosting Settings
Please make sure for your 'Preferred domain', that you select the first option, in the format of www.domain.com.