Learn how to require authenticated binding between Mac OS X clients and a Mac OS X Server. This setting is no longer available as a checkbox after installing Mac OS X Server v10.6.3 or later, or Security Update 2010-002 for Mac OS X Server v10.5.8. This setting only affects Mac OS X clients binding to a Mac OS X Server
Source:Mac OS X Server v10.5, 10.6: How to require authenticated binding between server and clients
