To resolve this issue, make sure that network user accounts do not have duplicate "CN=" names. To make this easier, consider ...

To resolve this issue, make sure that network user accounts do not have duplicate "CN=" names. To make this easier, consider exporting Active Directory contents to a text file for review. For information about how to do this, see Knowledge Base article: 237677 at http://go.microsoft.com/fwlink/?LinkId=298675.