Subdomain SSL Not Working When Proxied

Hello,

I have an Amazon EC2 instance running. There, I installed an admin web panel.

I then created a domain, set up Cloudflare, and attached an origin certificate to it. Everything works just fine with proxy on and in Full (strict) mode.

However, I have also created a subdomain to access my admin panel, which is something like https://admin.domain.com:8443/. Along with that, I created a new SSL certificate and added it to this new subdomain (I made sure to issue the SSL for admin.domain.com).

The issue is the SSL certificate only works when proxy is off. When it’s on, Cloudflare returns a 526 handshake error message.

What seems to be the issue here?

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