This security enhancement is new in the Solaris Express 6/05 release.
A new option has been added to the /etc/warn.conf file. This option enables the ktkt_warnd daemon to automatically renew credentials for users who are logged in. If the renew option is set, the users no longer need to run the kinit -R command in order to renew their credentials. In addition, options have been added to the /etc/warn.conf file that enable you to log the result when a renewal attempt is made.
See the warn.conf(4) man page for more information.