Security Error,  Login Failure # 529 on SBS2003 server from Client Computer

Posted on 2011-10-21
Last Modified: 2013-12-23
Each day one of our client computers has about 150 of these login failures. Reason: Unknown user name or bad  password User: "Name of workstation". How do I troubleshoot this?  Thanks in advance for yor help.  Michael
Question by:coopfab
    LVL 5

    Accepted Solution

    Several possible reasons:
    Expired password (simple)
    Machine account needs to be reset
    Remembered connection using a specified ID that has changed/expired
    Services using an ID that has changed/expired
    Shared computer with multiple users having shared connections - possible cause - offline files trying to sync but under a user with no access
    Outlook mailboxes that no longer have access
    Terminal server connection with authentication level issues (XP needing update)
    Kerberos issues, network issues, etc...

    Author Comment

    Thanks for all your suggestions. Haven't been able to narrow down the possible issue but I'm still working on it.

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