Microsoft KB Archive/919578

= The Winlogon.exe process uses excessive CPU resources when a user reinserts a smart card to log on to a Windows Server 2003 Service Pack 1-based terminal server =

Article ID: 919578

Article Last Modified on 10/11/2007

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APPLIES TO

 Microsoft Windows Server 2003 SP1, when used with:  Microsoft Windows Server 2003, Standard Edition (32-bit x86)

 Microsoft Windows Server 2003, Enterprise Edition

 Microsoft Windows Server 2003, Standard x64 Edition

 Microsoft Windows Server 2003, Enterprise x64 Edition</li></ul>

 Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems</li></ul> </li></ul>

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SYMPTOMS
Consider the following scenario. You have a Microsoft Windows Server 2003 Service Pack 1 (SP1)-based terminal server in your organization. To log on to this terminal server, a user is required to use an Infineon smart card together with the cryptographic service provider (CSP) that is included with Windows Server 2003. When the user exits the terminal server session, the user removes the smart card from the smart card reader that is connected to the client. Although the local system is configured to lock the terminal server session at this point, the local session remains unlocked.

Then, the user reinserts the smart card. Even though the local session is unlocked, the terminal server session no longer responds. Additionally, CPU usage for the Winlogon instance that belongs to the user session increases to almost 100 percent of the system's resources.

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CAUSE
This problem occurs because Windows Server 2003 SP1 handles the internal objects for the smart card differently from the way that Windows Server 2003 handles this situation.

The CSP has clean-up code that does not recognize the combination of data field contents. Therefore, the clean-up code generates an endless loop. This behavior causes the session to stop responding (hang). This, in turn, triggers a significant increase in CPU usage.

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Service pack information
To resolve this problem, obtain the latest service pack for Windows Server 2003. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

889100 How to obtain the latest service pack for Windows Server 2003

Prerequisites
You must have Windows Server 2003 SP1 installed to apply this hotfix.

Restart requirement
You must restart your computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.Windows Server 2003 with SP1, x86-based versions

Windows Server 2003 with SP1, x64-based versions

Windows Server 2003 with SP1, Itanium-based versions

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WORKAROUND
To work around this problem, uninstall Service Pack 1 for Windows Server 2003.

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STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section. This problem was first corrected in Windows Server 2003 Service Pack 2.

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MORE INFORMATION
For more information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

Keywords: kbbug kbfix kbqfe kbpubtypekc kbhotfixserver kbwinserv2003sp2fix KB919578

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