I just recently setup a new VPS to install discourse.

First step was to create my subdomain on cloudflare.

Then I ssh'd into the VPS and start executing the discourse install commands.

I was stuck on the very begining because the script said it was impossible to contact my IP adress on the 443 port.

What ?

I disabled the cloudflare proxy and everything was ok !

You can re-enable the proxy later :)