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Event ID: 11 Source: Kerberos-Key-Distribution-Center

Level
Description
The KDC encountered duplicate names while processing a Kerberos authentication request. The duplicate name is MSSQLSvc/domainlocal:57132 (of type DS_SERVICE_PRINCIPAL_NAME). This may result in authentication failures or downgrades to NTLM. In order to prevent this from occuring remove the duplicate entries for MSSQLSvc/domainlocal:57132 in Active Directory.
Comments
 
According to T733945, this can be resolved by removing the duplicate service prinicipal name. See the article for details.
The following articles may assist in troubleshooting this issue:
- EV100459 (Quickly Explained: Service Principal Name: Registration, Duplication)
- EV100460 (Kerberos Authentication problems Service Principal Name (SPN) issues)
- EV100461 (New features in SETSPN.EXE on Windows Server 2000)
- EV100462 (The KDC encountered duplicate names while processing a Kerberos authentication reques)

The dcdiag and ldifde commands may also provide important clues about the source of the problem.

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