3.1.1.3.2.40 spnRegistrationResult
When running as AD DS on Windows Server 2008 R2 operating system and later, this value is 0. When running as AD LDS, if the DC was unable to register its service principal names (SPNs) ([MS-DRSR] section 2.2.2), this attribute returns the Windows error code associated with the failure. Otherwise, it returns zero.
Note When running as AD DS on Windows Server 2003 operating system through Windows Server 2008 operating system, this value is the Windows error code that is associated with the failure if the DC was unable to register its SPNs, or zero upon success.