Service Ticket Request Failed - 677?

From: JR (johnnyrNOSPAM@bellsouth.net)
Date: 11/27/02 

From: "JR" <johnnyrNOSPAM@bellsouth.net>
Date: Wed, 27 Nov 2002 16:31:42 -0500

Win2k Server SP3 / AD integrated DNS
WinXp Pro SP1 clients

I get this error event in my security log on a regular basis.
Users can login and use resources, but this error event keeps
appearing. All PCs are referenced in the event messages, so
it isn't just one or two PCs.
Does anyone know what it means or how to stop it? I checked
eventid.net and google, but no help. Actually, at google there
were quite a few posts about this, but no one seems to know
what causes it.

Event Type: Failure Audit
Event Source: Security
Event Category: Account Logon
Event ID: 677
Date: 11/27/2002
Time: 6:12:33 AM
User: NT AUTHORITY\SYSTEM
Computer: SRV2K01
Description:
Service Ticket Request Failed:
  User Name: ARBORXP$
  User Domain: ARBOR01.COM
  Service Name: krbtgt/ARBOR01.COM
  Ticket Options: 0x2
  Failure Code: 0x20
  Client Address: 10.90.10.12