Kerberos tickets can expire in the middle of a running session.
The typical life time of a Kerberos ticket is 8 hours.

With fix for 4837364, we added support to renew this ticket in the
ticket cache. Hence users can obtain renewed ticket from the ticket cache.
However, the session needs to be restarted.

Need to add support to renew Kerberos Ticket automatically.

This needs to be done carefully, holding tickets for long period of
time can expose credentials for potential thefts.

Microsoft has added support to automatically renew the tickets. Should
check how it's handled in Windows environment.