We have a windows server 2008 r2 domain controller and a windows server 2003 r2 domain controller at our main office. We are receiving Event 11 Kerberos-Key-Distribution-Center errors and details are below:
The KDC encountered duplicate names while processing a Kerberos authentication request. The duplicate name is cifs/TT-AV (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 cifs/PE-AV in Active Directory.
Another example of the error
The KDC encountered duplicate names while processing a Kerberos authentication request. The duplicate name is cifs/TT-data (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 cifs/pe-data in Active Directory.
We are also receiving on another server Event ID 10154- Windows Remote Management
The WinRM service failed to create the following SPNs: WSMAN/TT-DATA.va.vector.dom; WSMAN/TT-DATA.
Additional Data
The error received was 8235: %%8235.
User Action
The SPNs can be created by an administrator using setspn.exe utility.
Can someone advise what these errors mean, what we can do to fix them.