Cloudflare is not working with my VPS

I have my domain with and
My VPS is hosted with Interserver and i want SSL certificate from cloudflare.

So i gave NamerServer
derek ns cloudflarecom and june ns cloudflare com and my VPS ip address but i am geeting error. Have a look this is my domain

Can anyone help me to resolve this issue, i am trying for last 4 days even i contacted cloudflare but nobody helped me… Please help me with this answer…

Yes we can. First check this out:

99% of 521 errors can be solved with these tips

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