Logon Failures with user name (backslash)

50 pts.
Tags:
Event ID 529
Logon failure
Windows Server 2003
Windows Server User Profiles
I'm looking for clues why a Win2k3 server log indicates very frequent logon failures with the user name ... yes, that is a backslash as the only character in the user name.

Software/Hardware used:
Windows 2003 Server
ASKED: January 22, 2010  5:59 PM
UPDATED: August 31, 2011  4:24 PM

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It may be that the actual username is unprintable characters. I would recommend that you read my blog posting <a href=”http://itknowledgeexchange.techtarget.com/it-trenches/tracking-down-that-usercomputer-that-locks-ad-accounts/”>Tracking down that user/computer that locks AD accounts</a>. It may give you information about the source computer(s) creating these anomalous login events.

In the IT trenches? So am I – read my <a href=”http://itknowledgeexchange.techtarget.com/it-trenches”>IT-Trenches blog</a>

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  • Gent01
    If the log does not indicate rather the login attempt came from someone one the local machine or from outside the machine, I would be tempted to start up a packet sniffer and look to see if it's coming from an outside source. Also make sure virus scanner is up to date and do a full scan.
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  • Cybernorris
    Have contemplated this already. However this is happening on Citrix servers, so the source IP is the same as the server IP. Someone from a log management company suggested this might be a symptom of a kerberos error.
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  • Siedelbe
    Did you ever get a good solution to this problem?
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