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Applies To: Windows Server 2008
Service principal names (SPNs) are stored as a property of the associated account object in Active Directory Domain Services (AD DS). An SPN is used by Kerberos to uniquely identify an account that is requesting access to a resource.
Events
| Event ID | Source | Message |
|---|---|---|
Microsoft-Windows-Kerberos-Key-Distribution-Center |
The KDC encountered duplicate names while processing a Kerberos authentication request. The duplicate name is %1 (of type %2). This may result in authentication failures or downgrades to NTLM. In order to prevent this from occuring remove the duplicate entries for %1 in Active Directory. | |
Microsoft-Windows-Kerberos-Key-Distribution-Center |
A service ticket request by client %1 for %2 was rejected because User2User was required. The KDC responds with this error when a client requests a service ticket for a user principal (a security risk). The client must support User2User in order to obtain a service ticket for the requested service principal |