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Duplicate User Principal Names have been detected

Duplicate_User_Principal_Names_have_been_detected_5_Rule (Rule)

Knowledge Base article:

Summary

While trying to build a Kerberos ticket, the Key Distribution Center (KDC) detected two user objects with the same user principal name (UPN). The KDC cannot determine which user object is correct; therefore, it cannot create a ticket.

Causes

The Users and Computers Microsoft Management Console (MMC) snap-in checks for this problem and attempts to prevent it from occurring. However, the following situations can create this condition:

Resolutions

Change the UPN on one of the conflicted user objects using the Users and Computers snap-in.

External

For more information, see:

Element properties:

TargetMicrosoft.Windows.Server.2012.R2.AD.DomainControllerRole
CategoryEventCollection
EnabledTrue
Event_ID11
Event SourceMicrosoft-Windows-Kerberos-Key-Distribution-Center
Alert GenerateFalse
RemotableTrue
Event LogSystem
CommentMom2005ID='{82145074-FBAC-4362-AE62-C3BE4B0C9125}';MOM2005GroupID=

Member Modules:

ID Module Type TypeId RunAs 
DS DataSource Microsoft.Windows.EventProvider Default
CollectEventData WriteAction Microsoft.SystemCenter.CollectEvent Default
CollectEventDataWarehouse WriteAction Microsoft.SystemCenter.DataWarehouse.PublishEventData Default

Source Code:

<Rule ID="Duplicate_User_Principal_Names_have_been_detected_5_Rule" Comment="Mom2005ID='{82145074-FBAC-4362-AE62-C3BE4B0C9125}';MOM2005GroupID=" Enabled="true" Target="AD2012R2Core!Microsoft.Windows.Server.2012.R2.AD.DomainControllerRole" ConfirmDelivery="true" Remotable="true" Priority="Normal" DiscardLevel="100">

  <Category>EventCollection</Category>

  <DataSources>

    <DataSource ID="DS" TypeID="Windows!Microsoft.Windows.EventProvider">

      <ComputerName>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</ComputerName>

      <LogName>System</LogName>

      <Expression>

        <And>

          <Expression>

            <SimpleExpression>

              <ValueExpression>

                <XPathQuery>EventDisplayNumber</XPathQuery>

              </ValueExpression>

              <Operator>Equal</Operator>

              <ValueExpression>

                <Value>11</Value>

              </ValueExpression>

            </SimpleExpression>

          </Expression>

          <Expression>

            <SimpleExpression>

              <ValueExpression>

                <XPathQuery>PublisherName</XPathQuery>

              </ValueExpression>

              <Operator>Equal</Operator>

              <ValueExpression>

                <Value>Microsoft-Windows-Kerberos-Key-Distribution-Center</Value>

              </ValueExpression>

            </SimpleExpression>

          </Expression>

          <Expression>

            <RegExExpression>

              <ValueExpression>

                <XPathQuery>EventData/Params/Param[2]</XPathQuery>

              </ValueExpression>

              <Operator>MatchesMOM2005RegularExpression</Operator>

              <Pattern>(8)|(DS_USER_PRINCIPAL_NAME)</Pattern>

            </RegExExpression>

          </Expression>

        </And>

      </Expression>

    </DataSource>

  </DataSources>

  <WriteActions>

    <WriteAction ID="CollectEventData" TypeID="SC!Microsoft.SystemCenter.CollectEvent"/>

    <WriteAction ID="CollectEventDataWarehouse" TypeID="SCDW!Microsoft.SystemCenter.DataWarehouse.PublishEventData"/>

  </WriteActions>

</Rule>