Advanced Digest Authentication Failure

From: Ralish (
Date: 10/29/05

Date: Sat, 29 Oct 2005 15:11:10 +1000


An IIS 6.0 server setup on a Windows Server 2003 Domain Controller is no
longer successfully authenticating clients. The server is set to
authenticate clients using Advanced Digest Authentication, and has been
working flawlessly for the past few months. However, now whenever a client
attempts to authenticate to the web-server, they are prompted to
authenticate three times, before receiving a "You are not authorized to view
this page" message.

An inspection of the Security Event Log on the server returns the following
curious event:

Event Type: Failure Audit
Event Source: Security
Event Category: Logon/Logoff
Event ID: 537
Date: 29/10/2005
Time: 3:07:11 PM
Computer: <cut>
Logon Failure:
  Reason: An error occurred during logon
  User Name: <cut>
  Domain: <cut>
  Logon Type: 3
  Logon Process: WDIGEST
  Authentication Package: WDigest
  Workstation Name: -
  Status code: 0xC000006D
  Substatus code: 0xC000000D
  Caller User Name: -
  Caller Domain: -
  Caller Logon ID: -
  Caller Process ID: -
  Transited Services: -
  Source Network Address:
  Source Port: 1940

For more information, see Help and Support Center at

I am at a total loss as to what this event means, let alone how to resolve
the problem. However, this event almost certainly appears to be the culprit
of the problem. Any help in resolving this problem would be greatly
appreciated, as the IIS server is unable to authenticate clients until this
issue is resolved.

Thanks in advance,


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