Daily I get a couple hundred event 4768 audit failures on my DC from a user who is no longer here and who's account I have disabled. The ticket options are 0x40810010 and result code is 0x12 service ID is Null which is consistent with the user account being disabled. The account name is the user name and the PC name since they were the same. The PC has since been re-imaged. The client address is ::ffff10.0.1.236 (my exchange server) I just don't understand why I'm seeing these errors. Any ideas would be appreciated.