The settings are to automatically mirror all Apple updates. These updates are then provided over port 8088. Settings can be seen as follows:
In order to disable an update that may be problematic for your environment, you can click on the Updates tab and uncheck the Enable dialog for the specified update.
Setting up a Software Update Server if you are using Open Directory is a fairly simple task. Just open Workgroup Manager, connect to an OD server or the appropriate Directory Service and then click on the computer or computer group you would like to edit the software update information for and then click on Preferences. Then click on Software Update and type in the appropriate URL. But what if the system is not managed using Open Directory. Well, that’s when you would use ARD to send out the following command or run it on your GM at imaging time