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Cloudflare SSL certificate not cover www.sub.domain.com

I have a website (prototype website for the lab where I am the research assistant). It is under chenpan.xyz, and I deployed an SSL certificate for www.sub.chenpan.xyz (I am a WWW friend now!).

Like my other websites, I enabled Cloudflare for it. But it stopped working! I got the following error from the browser:

This site can’t provide a secure connection.

www.sub.chenpan.xyz uses an unsupported protocol.

ERR_SSL_VERSION_OR_CIPHER_MISMATCH

After spending some time debugging, I found out it was because the regular SSL certificates from CloudFlare didn’t cover www.sub.domain.com. That’s why.

I had two options:

  1. Disabled CloudFlare CDN for www.sub.chenpan.xyz.
  2. Forget about www.sub.chenpan.xyz, just use sub.chenpan.xyz

What option do you think I chose?

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