A Noob here trying to install Discourse on a Digital Ocean droplet and getting the Port 443 warning.
Hostname for your Discourse? [discourse.example.com]: discourse.chaffeespeaks.com
Checking your domain name . . .
WARNING: Port 443 of computer does not appear to be accessible using hostname: discourse.chaffeespeaks.com.
WARNING: Connection to http://discourse.chaffeespeaks.com (port 80) also fails.
The ports seem active.
The host is Godaddy and they installed a basic webpage.
I have the same problem with Digital Ocean droplet “WARNING: Port 443”. It is [diskusia.ucto.info] and it is pointed to the IP of the droplet 188.8.131.52 There is no CDN with the hosting hostarmada between the DNS and the droplet. But it cannot be installed becasue of the port 443. I was traying also other domain registered with other provider, but there is the same error.