ERROR_DS_SPN_VALUE_NOT_UNIQUE_IN_FOREST | Windows Error Code
This page will publish a list of related information on error codes frequently seen on Windows.
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2.2 Win32 Error Codes
http://msdn.microsoft.com/en-us/library/cc231199.aspx
3.1.1.5.1.3 Uniqueness Constraints
http://msdn.microsoft.com/en-us/library/dn392337.aspx
SPN and UPN uniqueness
http://technet.microsoft.com/en-us/library/dn535779.aspx
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[Windows Error Message List]