Parece mais provável que algo esteja errado com sua configuração - como você adicionou o Open Directory Server no Directory Utility como o que você deseja é exatamente como ele deve funcionar.
Além disso, antes de muito mais, verifique seu DNS, pois o DNS causará todos os tipos de problemas com o Open Directory.
Para obter instruções, consulte os documentos: Abra o PDF do Administrador do Diretório , especificamente: página 118 citada:
To connect to a standard or workgroup configuration server:
1 Open Directory Utility (in /Applications/Utilities/).
2 If the lock icon is locked, unlock it by clicking it and entering the name and password of an administrator.
3 Click Directory Servers, then click the Add (+) button.
4 From the “Add a new directory of type” pop-up menu, choose Open Directory.
5 In the “Server Name or IP Address” field, enter the server name or IP address.
6 (Conditional) Before you select the “Encrypt using SSL” checkbox, check with your Open directory administrator to determine if SSL is needed.
7 In the Introduction pane, a list of services offered by the server you are connecting to are displayed, click Begin Setup.
8 Enter the Authentication information for the server you are connecting to.
In the name and password field, enter the administrator name and password for the server you are connecting to.
Enter the password for the user account that appears in “Enter the password for the account username on this computer.”
9 Click Continue.
10 Under Configuration Options, choose to let Directory Utility configure your applications or not.
Select Yes if you want the server to configure your application to use services that it offers.
Select No to bypass this configuration.
11 Click Continue.
12 Click Finish Setup.