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Recreate the LKDC in 10.6 in one command

Delete /var/db/.configureLocalKDC and reboot.
(Or if you are creating the image, make sure to remove this from the .dmg before deploying)
(Or if didn’t notice this until you deployed a few hundred machines, you can use ARD to just push a unix command as root, rm /var/db/.configureLocalKDC)