[warn] RSA server certificate CommonName (CN) `CloudFlare Origin Certificate' does NOT match server name!?

Have added Cert from Origin Server and configure to Full (strict) but the site return 521 error.

Apache error log with below message when starting:
[warn] RSA server certificate CommonName (CN) `Cloudflare Origin Certificate’ does NOT match server name!?

A 521 does not indicate a certificate issue but a general network issue. Make sure no firewall is blocking Cloudflare requests and the addresses from cloudflare.com/ips are whitelisted.

And yes, Origin certificates do not have the hostname in the CN but only in the SANs. That’s not an issue, though. That warning you can ignore.

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Thanks for prompt reply. So, should be Apache issues ?

Could be, but also a firewall issue.

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