root@dlp:~# su - wheezy # switch to a user who set VNC
wheezy@dlp:~$ vncpasswd # set VNC password
Password:# set
Verify:
wheezy@dlp:~$ vncserver :1 # start
xauth:  file /home/wheezy/.Xauthority does not exist

New 'dlp:1 (wheezy)' desktop is dlp:1

Creating default startup script /home/wheezy/.vnc/xstartup
Starting applications specified in /home/wheezy/.vnc/xstartup
Log file is /home/wheezy/.vnc/dlp:1.log

wheezy@dlp:~$ vncserver -kill :1 # stop
Killing Xvnc4 process ID 3919
wheezy@dlp:~$ vi .vnc/xstartup
# add follows
exec gnome-session &
# start with diplay number '1', screen resolution '800x600', color depth '24'
wheezy@dlp:~$ vncserver :1 -geometry 800x600 -depth 24 

New 'dlp:1 (wheezy)' desktop is dlp:1

Starting applications specified in /home/wheezy/.vnc/xstartup
Log file is /home/wheezy/.vnc/dlp:1.log