Event ID 529 on SBS

I have a SBS2003 and Standard Server 2003 (Terminal Server) environment. Evnet log shows over 3500 occurances of event ID 529, with the following detail -

Reason:      Unknown user name or bad password
User Name:      admin
Domain:      SSR
Logon Type:      8
Logon Process:      IIS
Authentication Package:      MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
Workstation Name:      SSR-SVR1
Caller User Name:      SSR-SVR1$
Caller Domain:      SSR
Caller Logon ID:      (0x0,0x3E7)
Caller Process ID:      1764
Transited Services:      -
Source Network Address:      -
Source Port:      -

NB. SSR-SVR1 is the SBS. I have no non-standard IIS processes running, although I have configured an FTP site locally.

I generally find the myriad of things event 529 refers to confusing - can someone help explain how IIS can be attempting authentication this many times?

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qtgAuthor Commented:
Issue has not reocurred, but I have heeded the posts above (Administrator account does not lock after unsuccessful attempts). Thanks.
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