Masses of 529 Errors!

I have often seen these errors in the security log at the rate of up to
hundreds in a 24 hour period, but in the last 24 hours I had 107,710 of
them. Is this something I should be worrying about? Obviously the fact that
I know about it means that who/whatever is doing this is unsuccessful. Below
is pasted one of the events:

Event Type: Failure Audit
Event Source: Security
Event Category: Logon/Logoff
Event ID: 529
Date: 11/05/2007
Time: 10:20:37 PM
User: NT AUTHORITY\SYSTEM
Computer: <my sbs server>
Description:
Logon Failure:
Reason: Unknown user name or bad password
User Name: anonymous
Domain:
Logon Type: 3
Logon Process: Advapi
Authentication Package: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
Workstation Name: <my sbs server>
User Name: <my sbs server>
Caller Domain: <my domain>
Caller Logon ID: (0x0,0x3E7)
Caller Process ID: 1216
Transited Services: -
Source Network Address: -
Source Port: -

Advice most welcome, please.

Bill



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Relevant Pages

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