Before starting vncserver as a service, let's create a vnc password with vncpasswd command.
Notice it creates a hidden directory .vnc under your home account with file passwd which contains your vnc password.
[tchung@tchung101 tchung]$ vncpasswd Password: Verify: [tchung@tchung101 tchung]$ ls -d .vnc .vnc [tchung@tchung101 tchung]$ ls .vnc passwd [tchung@tchung101 tchung]$