Security Log fills up in 3 minutes. why?

From: Stoyan (stoyan@ihatespam.com)
Date: 05/15/02 

From: "Stoyan" <stoyan@ihatespam.com>
Date: Wed, 15 May 2002 11:57:54 +0300

Hi,
I was checking the event viewer when i noticed that the security log was
being flooded with failures. The computer is a domain controller of a small
domain.
Here is an extract from the log. Can anyone tell me what does it mean?
-----------------------------------------------------
Event Type: Failure Audit
Event Source: Security
Event Category: Object Access
Event ID: 560
Date: 5/15/2002
Time: 11:47:16 AM
User: DOMAIN\username
Computer: BRO
Description:
Object Open:
  Object Server: Security
  Object Type: Desktop
  Object Name: \Winlogon
  New Handle ID: -
  Operation ID: {0,33549067}
  Process ID: 3276
  Primary User Name: username
  Primary Domain: DOMAIN
  Primary Logon ID: (0x0,0x180E3D)
  Client User Name: -
  Client Domain: -
  Client Logon ID: -
  Accesses MAX_ALLOWED
   Read Objects
   Write objects

  Privileges -
 -----------------------------------------------------

Stoyan

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