Duplicate SPN registered in domain.

Sometimes, your domain controller may report an error for duplicate SPN names registered in Active directory database. These errors are logged when you have duplicate SPN names but don’t know their exact location to delete them.

You can use a Microsoft tool called LDP.exe or LDIFDE.exe to search duplicate SPN and remove them from the domain.

Check out here:

http://support.microsoft.com/kb/321044

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