Active Directory Domain And Trusts Error
Before the Local Security Authority (LSA) creates the trust, the LSA verifies the consistency of the parameters. Between the new trust partner and all other domains that are in the same
forest as the trust partner, the following items must be unique:
- The NetBIOS name of the domain
- The fully qualified domain name (FQDN) of the domain
- The security identifier (SID) of the domain
You cannot create the trust if one of the three items has duplicates.