ubuntu vnc server authentication failure error each day

[goodweber]

I have 4 remote servers, Ubuntu Precise Pangolin 12.04LTS

I set up graphical user interface & remote desktop by following this tutorial
http://www.havetheknowhow.com/Configure ... l-VNC.html

everything worked fine, but I'm getting "authentication failure error" each day.
then I need to kill VNC session using command vncserver -kill :1 and need to recreate new session using command vncserver -geometry 1802x933

We have 5 users on each server, a tightvnc login shortcut for each user, total 20 shortcut files.
Recreating vnc sessions became wastage of time.

Is there a fix so I can avoid doing this step each day.