Linux - Steps to configure VNC server instance

Login to the Linux box and run below command :
vncserver

It will ask for password and confirm password :
password : *****
confirm password : *****

Now you can connect to linux box through VNC viewer with created instance and password.

In case, it is not connecting, perform following commands :
su root
/etc/init.d/iptables save
/etc/init.d/iptables stop