I have seen articles talking about a script that Michael Bartosh wrote "We next need to change /etc/authorization. This will allow the loginwindow to automatically start the Kerberos process when you log in. The easiest way to do this is to use a simple AppleScript from Michael Bartosh’s site. This will make the necessary changes to /etc/authorization for you. Additionally you should check out Apple KBase article #107154.
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Of course the website is no longer in service, I am looking for the Applescript that is referred in the above section.