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Are there sub-domains I shouldn't enable with CloudFlare?

Subdomains on CloudFlare are marked with an orange cloud. Subdomains not on CloudFlare are marked with a gray cloud.

The CloudFlare network can only proxy web traffic over port 80 and 443. 

The following sub-domains should be marked with a gray cloud to prevent performance issues:

cpanel
ftp
mail
webmail
nameservers (NS1, NS2)

View the full list of sudomains here:

http://www.cloudflare.com/wiki/What_subdomains_are_appropriate_for_orange_/_gray_clouds%3F

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