i have already provide Some more information in above comment
That case Below option you have configured
Check After to specify the time after which clients must bypass the Group Update Provider. Specify the time in minutes, hours, or days.
If you don't want no any effect you can select below option.
Check Never if clients only get updates from the Group Update Provider and never from the server. For example, you might use this option if you do not want client traffic to run over a wide area connection to the server
http://www.symantec.com/business/support/index?page=content&id=TECH96419