I am doing a few tests with OS X Server before I have to do a deploy in a few months. I have configured Open Directory, and created a few users. I've configured Directory Utility on a 10.5 client, but the login authentication doesn't work the way I would expect. I would expect I could user a username/password from any user created in Open Directory and be able to log into the client. Instead, it appears I need to create a local user, which you then sync with a directory user using Directory Utility.

Alternatively, if I add an Active Directory config to the client, I can use any AD user, as I would expect.

Am I hoping for the impossible, or is something likely wrong with the configuration?