yum install xinetd tigervnc-server

vi /etc/gdm/custom.conf
[xdmcp]
Enable=true

vim /etc/xinetd.d/vnc
service vnc
{
   disable = no
   socket_type = stream
   protocol = tcp
   instances = 32
   wait = no
   user = nobody      
   server = /usr/bin/Xvnc
   server_args = -desktop myvnc -inetd -query localhost -once -SecurityTypes None -IdleTimeout 60
   type = UNLISTED
   port = 5900
}
service xinetd start
chkconfig xinetd on

vi /etc/inittab
id:5:initdefault:
 
 vi /etc/sysconfig/iptables
-A INPUT -p tcp -m state --state NEW -m tcp --dport 5900 -j ACCEPT
service iptables restart