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Based on an analysis of the process, the AD server will always record an event for pre-authentication required while it is a normal process. You can safely ignore this security event.

However, if you want to disable logging of the pre-authentication events for the admin account that IWSVA uses:

  1. In AD, go to the property of the admin account.
  2. Click the Account tab.
  3. Under Account options section, tick the Do not require Kerberos pre-authentication check box.