Symptom
If you use Open Directory Assistant to configure a non-server installation of Mac OS X, it will not configure the system.
Note: Open Directory Assistant is installed with the Mac OS X Server Admin Tools.
Solution
You should only use the Open Directory Assistant to configure Mac OS X Server.
Note: You may use Open Directory Assistant remotely from a Mac OS X client to configure a Mac OS X Server.
Though Open Directory Assistant allows selection of non-server systems, only Mac OS X Server includes software components required for the Open Directory Assistant to work.