Kerberos client failures
This page will, when switch is turned on, monitor all failing Kerberos challenges coming in from the users in your organization. A fail can happen whenever something is not completely right with the Kerberos setup and in certain situations this could affect only parts of your users. The other test resources mentioned on the Kerberos overview page is helpful to understand the problem. Also enabling logging to file can be useful to monitor and understand the problem.