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.