Error Code: 0x19 KDC_ERR_PREAUTH_REQUIRED

Hi Jim_Hall_MWSU,

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0x19 (KDC_ERR_PREAUTH_REQUIRED) "Additional pre-authentication"

The client did not send pre-authorization, or did not send the appropriate type of pre-authorization, to receive a ticket. The client will retry with the appropriate kind of pre-authorization (the KDC returns the pre-authentication type in the error). Many Kerberos implementations will start off without preauthenticated data and only add it in a subsequent request when it sees this error. In this case, this error can safely be ignored.

Method 1: If you confirm that no action is required and you do not want these events to keep coming, you could enable the “Do not require Kerberos preauthentication” option for that user account in Active directory users & computers -> <user> properties -> account” (but this will lower the security level for that account).

Also check out the following link and follow the steps mentioned by Mervyn Zhang to resolve this issue:

http://social.technet.microsoft.com/Forums/en-US/winserverDS/thread/78f1026a-7531-4228-b00a-4a334810b539

Regards,

Divya R – Microsoft Support.

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