If you install OS X Yosemite v10.10.3, migrate your server from a Time Machine backup, and then install Server v4.1, the setting for the certificate used by the Open Directory service might change. This could prevent clients from connecting over LDAP to the server using SSL.
Use these steps to correct this setting:
- Open Server app.
- Select Certificates in the sidebar.
- Click the “Secure services using” pop-up menu and choose Custom.
- If the certificate for the Open Directory service is set to None, click the word "None" and then select your certificate.
- Click OK.