[CentOS] problem to use up2date via vnc

Hi ,
I can't use the up2date launcher  when i log via vnc .here is the situation
:
i use the Icon of the update , the pop up : Centos alert notification tool
is appear ,then i use lunch up2date , Query pop up - -> then i write the
password ---> and from here nothing ...

when i log to my server via console every thing work  well.

thank in advance for any suggestions.

nisim.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.centos.org/pipermail/centos/attachments/20060301/7ffda8b0/attachment.html>