Create vnc passwd
x11vnc -storepasswd
Use authentication while connecting
x11vnc -rfbauth ~/.vnc/passwd
Keep the VNC Session after each login and logout
x11vnc -forever
Don't use shm of X if you have problems in display
x11vnc -noshm
So the final command is
x11vnc -noshm -forever -rfbauth ~/.vnc/passwd
