SSL Error in one sub domain, others are work fine

Hello, I’m using Cloudflare free plan and flexible SSL service.

Few days ago, I added ‘oss.download.example.org’ to Cloudflare.
And I can access this URL via unencrypted HTTP through Cloudflare.
But access via https, I got these errors.
Cloudflare free plan does not support SSL with nested sub domain?

I already tested:

* Access 'oss.download.example.org' via HTTP -> Success
* Access 'testothersub.download.example.org' via HTTP**S** -> Failed in same reason.
* Access 'download.example.org' via HTTP**S** -> Success
* Using Cloudflare, no direct access to origin -> OK

curl:

curl: (35) error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure

wget:

Connecting to oss.download.example.org (104.18.54.166:443)
wget: error getting response: Connection reset by peer

Chrome:

ERR_SSL_VERSION_OR_CIPHER_MISMATCH

SSL Test:

Cloudflare’s free Universal SSL does not cover a nested subdomain. You would need the Dedicated SSL With Custom Hostnames ($10/month) for that.

https://support.cloudflare.com/hc/en-us/articles/228009108-Managing-Dedicated-SSL-Certificates

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