- Launch System Preferences.app from the Applications folder and select the Users & Groups preference pane (Figure A).
- Select Login Options and click the padlock to authenticate as an administrator (Figure B).
- Next, click the Edit… button to display the list of directory servers the computer is bound to.
- Once bound, the list should contain the Active Directory domain (Figure C).
- Click the plus sign [+] to add another directory server. This time, enter the domain host name (or IP address) of the OS X Server hosting the Open Directory domain, and click the OK button to add it (Figure D).
- Prior to establishing the connection to the OD server, you’ll be prompted to accept the trust certificate for the server you’re binding to. This occurs when a self-signed certificate is used (by default) instead of a 3rd-party certificate. Click Trust to proceed (Figure E).
- Click Continue if you receive a prompt while attempting to establish an SSL connection with the server (Figure F).
- The directory list should now have an entry created for the Open Directory domain in addition to the Active Directory domain (Figure G).
- Click OK to return to the Users & Groups preference pane, and you’ll notice the word Multiple next to Network Account Server. This indicates the OS X client is bound to multiple directory services, and the green bulb next to each represents an established connection (Figure H).
The Active Directory and Open Directory domains are setup, and the OS X client has been bound to both services, receiving DNS and user authentication services from AD and managing settings and configuration from OD.