Strange Kerberos Errors in Event Log



We've started getting this error in our Security Event Log:

Event ID: 537, Type: Failure

Logon Failure:
Reason: An unexpected error occurred during logon
User Name:
Logon Type: 3
Logon Process: Kerberos
Authentication Package: Kerberos
Workstation Name: -

There is no username, domain, workstation name in the error. What can be
causing htis and how do I get rid of whatever it is?

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