Internet Information Services 6.0: FIX: An ISAPI Extension is passed an incorrect lpszPathTranslated value of the EXTENSION_CONTROL_BLOCK structure in Internet Information Services (IIS) 6.0

SUPPORT SOLUTION:
Consider the following scenario:You have Internet Information Services (IIS) 6.0 running on a server that is running Windows Server 2003 Service Pack 2 (SP2).You install an IIS ISAPI Extension on the computer that is running IIS 6.0.The ISAPI Extension processes the request inside the HttpExtensionProc function.The ISAPI Extension uses the lpszPathTranslated member of the EXTENSION_CONTROL_BLOCK structure that is passed by IIS to process the request.In this scenario, the lpszPathTranslated member of the EXTENSION_CONTROL_BLOCK structure may contain an incorrect value under certain circumstances. When this issue occurs, client requests may not be processed correctly. For example, you have a virtual directory, DirectoryA, that points to C:\DirectoryA, and your ISAPI Extension receives an HTTP client request in the following form:http://yourServer/path/yourISAPIVitualDirectory/yourISAPIExtension.dll/DirectoryA/DirectoryB/someFile.xml You expect that the lpszPathTranslated member of the EXTENSION_CONTROL_BLOCK structure contains the following:C:\DirectoryA\DirectoryB\somefile.xmlHowever, the lpszPathTranslated member of the EXTENSION_CONTROL_BLOCK structure contains an incorrect value. This causes a failure to process this client request. The issue occurs because of a race condition when IIS is processing two or more concurrent requests. A supported hotfix is 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 the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.If the hotfix is available for download, there is a “Hotfix download available” section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix. Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: http://support.microsoft.com/contactus/?ws=support
(http://support.microsoft.com/contactus/?ws=support)
Note The “Hotfix download available” form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.Prerequisites
2, ‘resolution’);
You must have Internet Information Services (IIS) 6.0 installed to apply this hotfix. Also, you must apply this hotfix on a server that is running Windows Server 2003 SP2.Restart requirements
3, ‘resolution’);
You must restart the computer after you apply this hotfix.Hotfix replacement information
3, ‘resolution’);
This hotfix does not replace any other hotfixes.File information
2, ‘resolution’);
The English (United States) version of this hotfix uses a Microsoft Windows Installer package to install the hotfix. The dates and the times for these files are listed in Coordinated Universal Time (UTC) in the following table. When you view the file information, the date 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.For all supported Internet Information Services version 6.0, 32-bit editions
4, ‘resolution’);
Collapse this tableExpand this tableFile nameFile versionFile sizeDateTimePlatformSP requirementHttp.sys5.2.3790.4693294,91214-Apr-201017:05×86SP2Httpapi.dll5.2.3790.469325,08819-Apr-201005:41×86SP2Strmfilt.dll6.0.3790.469386,52819-Apr-201005:41×86SP2W3core.dll6.0.3790.4786351,23214-Oct-201006:06×86SP2W3dt.dll6.0.3790.469339,42419-Apr-201005:41×86SP2W3isapi.dll6.0.3790.469362,97619-Apr-201005:41×86SP2For all supported Internet Information Services version 6.0, 64-bit editions
4, ‘resolution’);
Collapse this tableExpand this tableFile nameFile versionFile sizeDateTimePlatformSP requirementService branchHttp.sys5.2.3790.4693567,80814-Oct-201007:11×64SP2Not ApplicableHttpapi.dll5.2.3790.469337,37614-Oct-201007:11×64SP2Not ApplicableStrmfilt.dll6.0.3790.4693134,65614-Oct-201007:11×64SP2Not ApplicableW3core.dll6.0.3790.4786547,84014-Oct-201007:11×64SP2Not ApplicableW3dt.dll6.0.3790.469358,88014-Oct-201007:11×64SP2Not ApplicableW3isapi.dll6.0.3790.469384,99214-Oct-201007:11×64SP2Not ApplicableWhttpapi.dll5.2.3790.469325,08814-Oct-201007:11×86SP2WOWWstrmfilt.dll6.0.3790.469386,52814-Oct-201007:11×86SP2WOWWw3core.dll6.0.3790.4786351,23214-Oct-201007:11×86SP2WOWWw3dt.dll6.0.3790.469339,42414-Oct-201007:11×86SP2WOWWw3isapi.dll6.0.3790.469362,97614-Oct-201007:11×86SP2WOWFor all supported Internet Information Services version 6.0, IA-64-bit editions
4, ‘resolution’);
Collapse this tableExpand this tableFile nameFile versionFile sizeDateTimePlatformSP requirementService branchHttp.sys5.2.3790.4693815,10414-Oct-201007:01IA-64SP2Not ApplicableHttpapi.dll5.2.3790.469369,63214-Oct-201007:01IA-64SP2Not ApplicableStrmfilt.dll6.0.3790.4693254,97614-Oct-201007:01IA-64SP2Not ApplicableW3core.dll6.0.3790.47861,067,52014-Oct-201007:01IA-64SP2Not ApplicableW3dt.dll6.0.3790.469387,04014-Oct-201007:01IA-64SP2Not ApplicableW3isapi.dll6.0.3790.4693121,85614-Oct-201007:01IA-64SP2Not ApplicableWhttpapi.dll5.2.3790.469325,08814-Oct-201007:01×86SP2WOWWstrmfilt.dll6.0.3790.469386,52814-Oct-201007:01×86SP2WOWWw3core.dll6.0.3790.4786351,23214-Oct-201007:01×86SP2WOWWw3dt.dll6.0.3790.469339,42414-Oct-201007:01×86SP2WOWWw3isapi.dll6.0.3790.469362,97614-Oct-201007:01×86SP2WOWMicrosoft has confirmed that this is a problem in the Microsoft products that are listed in the “Applies to” section.For more information, visit the following MSDN webpages:HttpExtensionProc Function
(http://msdn.microsoft.com/en-us/library/ms525010(VS.90).aspx)
EXTENSION_CONTROL_BLOCK Structure
(http://msdn.microsoft.com/en-us/library/ms525658(VS.90).aspx)

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