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How to troubleshoot failed login attempts on an MS Server

alan-blair asked
Last Modified: 2012-05-12
I have a client who gets a lot of reported failed login attempts with no user name on their server. Is there any way I can track which PC or service these attempts come from?

Server: SBS 2003

Report example, (23 events for this day):
Reason:      An error occurred during logon
User Name:       
Logon Type:      3
Logon Process:      Kerberos
Authentication Package:      Kerberos
Workstation Name:      -
Status code:      0xC000006D
Substatus code:      0xC0000133
Caller User Name:      -
Caller Domain:      -
Caller Logon ID:      -
Caller Process ID:      -
Transited Services:      -
Source Network Address:
Source Port:      3789

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