We are getting the following error " event ID 11 The KDC encountered duplicate names while processing a Kerberos authentication request" on our DC (see attached text file). I've found the duplicate entry using "setspn -X" (see attached jpeg) however the duplicate entry is a user "Administrator" and not a computer. I can use "setspn -D" to delete the entry but I'm unsure what the SPN and computer name would be. I've never had to do this before and I don't know what the consequences are if I get it wrong. Can anyone help please.