Logon Logoff Event: 529

Event ID 529 – Logon Failure: Unknown User Name or Bad Password

When there is a logon failure, event 529 is generated on the server or workstation where the user failed to log on successfully.

This log data provides the following information:

• User Name
• Domain
• Logon Type
• Logon Process
• Authentication Package
• Workstation Name

Additionally, in Windows Server 2003, the following information is also made available:

• Caller User Name
• Caller Domain
• Caller Logon ID
• Caller Process ID
• Transited Services
• Source Network Address
• Source Port

Why does event ID 529 need to be monitored?

• To detect brute-force, dictionary, and other password guess attacks.
• To detect abnormal and possibly malicious internal activity.
• To come up with a benchmark for the account lockout threshold policy.
• To ensure compliance with regulatory mandates.

Pro Tip:

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