Did I mention the error 521 just resolved itself today?
I asked how you know Cloudflare is not reaching servers IPs becasue there is no 521 error anymore.
I am not a dev… excuse moi… so I thought I would dig information somewhere out there…
I will try to find more info on how to curl things and dig logs on ssh, because on portainer containers, logs look good. And I think CA is working after turning Cloudflare on, because it loads on browser. 2 IPs from 2 different servers are using the same domain, that is what I thought was wrong.