[corrida]

yes, I believe you would have to port it first or configure the main panel. If that doesnt work just check your computer settings to see if anything is blocking it.

[Unixfy]

Could you generate the cert successfully with the client? If yes, how?

Let's Encrypt client? I already said, the Let's Encrypt certs are not for MyCDN. I can't install stuff on the server (it's not mine, it's provided by a friend of mine) since I have jailed chroot access, but I'll ask him tonight and try.