if you’ve disabled the firewall, ports shouldn’t be blocked. If you have windows, try testing with telnet, i.e. telnet {ip} {port}, i.e. telnet 2.2.2.2 8443

by the way, we are building user friendly control panel ZoomAdmin.com, that you can connect all of your servers to and use user friendly UI to manage your servers, including Firewall. We are going into beta soon, be sure to sign-up to our mailing list if you’d like to try out beta for free and give feedback.

I enabled the ufw and allowed port 22 and it connected via telnet. However, when I allowed port 8443 and it still blocked access to the ubuntu server.

I will check out ZoomAdmin.com