Consider the following scenario:

•	You host a Common Gateway Interface (CGI) application on an Internet Information Services (IIS) 7.0 Web server.
•	After the CGI application processes a request, the CGI application sets multiple instances of a response header as part of its response.

In this scenario, only the last instance of the response header is sent to the client.

For example, the CGI application sets multiple "Set-cookie" response headers. However, the client receives only the last cookie value.

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In IIS 7.0, multiple value instances of the same response header are not appended. Instead, all instances are replaced by the last value only.

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Service pack information

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

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Update information

To resolve this problem, apply the update for the operating system that you have. For more information about this update, visit the following Microsoft Download Center Web sites:

•	Windows Vista, 64-bit versions http://www.microsoft.com/downloads/details.aspx?FamilyId=3B837AB4-4E0C-4E0A-B5A3-9ECEFD0E02DA (http://www.microsoft.com/downloads/details.aspx?FamilyId=3B837AB4-4E0C-4E0A-B5A3-9ECEFD0E02DA)
•	Windows Vista, all other versions http://www.microsoft.com/downloads/details.aspx?FamilyId=9DBA1A94-1885-4038-AF1D-A1E51D6EC8F8 (http://www.microsoft.com/downloads/details.aspx?FamilyId=9DBA1A94-1885-4038-AF1D-A1E51D6EC8F8)

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Hotfix information

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 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 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 Web site: 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

No prerequisites are required.

Restart requirement

You do not have to restart the 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 Vista, x86-based versions

File name	File version	File size	Date	Time	Platform
Cgi.dll	7.0.6000.20594	40,960	09-May-2007	08:50	x86

Windows Vista, 64-bit versions

File name	File version	File size	Date	Time	Platform
Cgi.dll	7.0.6000.20594	45,568	09-May-2007	09:47	x64
Cgi.dll	7.0.6000.20594	40,960	09-May-2007	08:50	x86

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows Vista Service Pack 1.

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This behavior can affect any CGI application that sets multiple instances of the same response header. One known example is Microsoft Virtual Server. If you host a Virtual Server Administration Web application on IIS 7.0, and you use the Virtual Server Administration Web application to change the Web site properties, the changes are not saved as expected. This occurs because personal settings of the Virtual Server Administration Web application are stored in the form of cookies. If the Virtual Server Administration Web application is hosted in IIS 7.0, and the application runs on a Windows Vista-based computer, only the last cookie that is set is saved.

Non-Microsoft CGI applications can also be affected. Microsoft has been notified that the Movable Type publishing platform application is affected by this problem.

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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