Only SSH and ICMP will be allowed at the end. However, during VNC installation we additionally need an open VNC Port 5901. This port should be removed after the VNC installation.
Don't forget to remember your password!
Example:
[home@home]
vncviewer YO.U.R.IP:5901
After successful CentOS installation you should remove the VNC port from the firewall. VNC will be available later via SSH tunnel.
Plase Note! Define a Source IP (e.g. the IP range of your internet provider) for ssh to expand security.
Next> Install CentOS 8.4