I installed paid SSL, and follow very very careful this article
But after I installed, I cannot access to my discourse, I had install and rebuid discouse again, again and again, eventhough, I re-install my VPS I’m really stupid. I forgot that I use Cloudflare DNS.
Cloudflare SSL default is Flexible. >>> then I Turn to Full Strict
Then I can access to my Discourse
I think this small tip that can be useful for a newbie guy with cloudflare, paid ssl, discourse like me, to a avoid simple mistake.