If you plan to use an LDAP server for authentication, ensure that you set up and configure a working LDAP server.
Orchestrator supports these directory service types.
Windows Server 2008 Active Directory
Windows Server 2012 Active Directory
Novell eDirectory Server 8.8.3
Sun Java System Directory Server 6.3
Multiple domains that have a two-way trust, but are not in the same tree, are not supported and do not work with Orchestrator. The only configuration supported for multi-domain Active Directory is domain tree. Forest and external trusts are not supported.