Install Discourse on Plesk(Ubuntu 18.04 LTS)

Hi!

Still getting:
“WARNING:: This server does not appear to be accessible at discourse.domain.com:443

Even if I changed checked ports in discourse-setup, and opened 8060 and 9443 in the firewall.

The subdomain discourse.agoraludica.eu is accessible from the internet.

Is there something like an IP to whitelist?