Open Directory is Apple's LDAP-based directory provided in Server.app. Open Directory is most often used to manage user accounts, groups, but it also contains settings and information for the entire networked system.

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How to fix failing Open Directory (database “cn=authdata” cannot be opened, err 12) after hang

A Mac OS X Lion 10.7.5 server running Open Directory hung. SSH was still possible but the sudo reboot command didn't restart the server within 15 minutes. That is why a power cycle was issued. After ...
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Unable to use SSL or TLS to access OpenDirectory ldap server

I am unable to connect with my openserver system using SSL/TLS connection. There are no issues communicating without SSL on port 389 and can connect and retrieve directory information without issue. ...