We have a strange thing going on here 00000071 ERROR: Could not find a source for updated packages

Hello all,

on a large part of our clients we can see this behaviour  (several 100's of about 4500+ clients)

10/5/2010 6:51:25 PM 00000071  ERROR: Could not find a source for updated packages
10/5/2010 12:30:06 PM 00000000  Updated successfully                    
 10/5/2010 11:30:08 AM 00000071  ERROR: Could not find a source for updated packages
  10/3/2010 1:20:44 PM  00000000  Updated successfully                    
   10/3/2010 12:27:48 PM 00000071  ERROR: Could not find a source for updated packages
   10/3/2010 8:42:38 AM 00000000  Updated successfully                   

The server is online all the time and can be reached from all locations.

This results in a lot of helpdesk tickets , user report a red cross on the programm icon.

Does anyone have an idea what this can be ?

Regards,

René