Active Directory Accidental Deletion – Prevention & Cure

                       Accidental deletions in active directory can cause havoc and unfortunately in the past I was in the middle of one such catastrophic event. It resulted in 4000 odd servers and client machines part of an OU to be deleted and the cause was found to be some housekeeping software. Such accidental deletions can be…

1

KDC_ERR_PREAUTH_REQUIRED vs. KDC_ERR_PREAUTH_FAILED

         I often seen network admins look at a network trace and say we have a lot of authentication failures and point to the error – KDC_ERR_PREAUTH_REQUIRED. I have spent time educating on why this is not an authentication failure but instead the default behavior. The KDC (Key Distribution Center) requires all accounts to use…

7