Managed Client: How to avoid seeing pre-release Apple software updates
Under certain circumstances, some computers may be offered pre-release Apple software updates. You can use Managed Client to make sure that pre-release software is not offered to Macs using OS X.
You can keep OS X systems from being offered pre-release Apple software updates either by pointing them to a local software update server, or by pointing them to the Apple public software update server.
When setting up your managed clients, use the following URL to point your OS X Mavericks systems to the Apple public software update server:
Note: This URL is only valid for systems running OS X Mavericks.