use command :
vncserver
to start the service of VNC .
New ‘localhost.localdomain:1 (yourname)’ desktop is localhost.localdomain:1
Starting applications specified in /home/yourname/.vnc/xstartup
Log file is /home/yourname/.vnc/localhost.localdomain:1.log
and when you want to connect to the server when you are in your client ,you should destinate the port that is the same to the server ,in above ,it is "1"