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Can you please let me know if your servers runs a UFW firewall as well? If you’re using UFW, you can view the current filtering rules by typing:
sudo ufw status verbose
If you get Status: inactive then it’s disabled and we need to look somewhere else to sort the issue.
Let me know how it goes.
Hello, @thethih
Have you create any custom rules in the Firewall? You can make sure that the Plesk port (8443) is open. I believe this article should help you to set this:
https://www.digitalocean.com/docs/networking/firewalls/how-to/configure-rules/
Let me know how it goes.