Microsoft KB Archive/899420

= An application that calls Cryptography API (CryptoAPI) functions may stop responding on a Windows XP-based computer =

Article ID: 899420

Article Last Modified on 9/11/2007

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APPLIES TO


 * Microsoft Windows XP Home Edition for Prepaid Computers
 * Microsoft Windows XP Professional

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SYMPTOMS
On a Microsoft Windows XP-based computer, an application that calls Cryptography API (CryptoAPI) functions may stop responding.



CAUSE
This problem occurs because of a defect in the Crypt32.dll file. In some cases, a LoaderLock issue may occur in CrytoAPI because of this defect. Therefore, this problem occurs.



Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
To apply the hotfix, one of the following service packs must be installed on the computer:
 * Microsoft Windows XP Service Pack 1 (SP1)
 * Microsoft Windows XP Service Pack 2 (SP2)

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

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

Registry information
You do not have to make any changes to the registry to use the hotfixes in this package.

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 XP with SP2, x86-based versions


STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
Software developers use CryptoAPI to add authentication, encoding, and encryption to Windows-based applications. For more information about CryptoAPI, visit the following Microsoft Web site:

http://msdn2.microsoft.com/en-us/library/aa380255.aspx

For more information about LoaderLock, visit the following Microsoft Web site:

http://msdn2.microsoft.com/en-us/library/ms172219.aspx

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

Keywords: kbexpertiseadvanced kbfix kbpubtypekc kbqfe kbhotfixserver KB899420

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