If your TGT (ticket-granting ticket) is still valid, you can renew it using Kerberos Manager or the Security Propertiesdialog box..
To renew a ticket from Kerberos Manager
Click Renew Ticketfrom the principal profile tab.
To renew a ticket from the Security Propertiesdialog box.
Click Renewfrom the Kerberostab of the Security Propertiesdialog box.