To troubleshoot Kerberos, enable Kerberos event logging by using Regedt32 to navigate to:
On the Edit menu, Add Value name LogLevel, using data type REG_DWORD, and set the data value to 1. Kerberos events will be recorded in the System event log.
Shutdown and restart your computer.
NOTE: You may have to add the Parameters key.
NOTE: Delete the LogLevel value name when you are finished troubleshooting, as the logging causes a performance hit.