FIX: A Web browser cannot display an ASP page of a web server that is running IIS 7.0 when the response is very large

This article has been archived. It is offered "as is" and will no longer be updated.
Consider the following scenario:
  • You install Internet Information Services (IIS) 7.0 and the Active Server Pages (ASP) IIS module on a computer that is running Windows Vista Service Pack 2 (SP2) or Windows Server 2008 SP2. 
  • You set the Enable Buffering property to True on the ASP feature in IIS manager. Then, you set the Response Buffering Limit property of the ASP feature to a large value. For example, you set the property to 419430400.
  • You have an ASP page that returns a large response. Specifically, the ASP page tries to send 64,000 or more elements without flushing the response.
  • You visit the ASP page in a web browser locally or from another computer.
In this scenario, you experience the following issues:
  • The web browser cannot load the ASP page. Then, the connection times out and you receive a notification that indicates that the webpage cannot be displayed.
  • If you check the IIS log, a "HTTP status code 200" entry is logged unexpectedly.
Note If the value in the Response Buffering Limit property is not large enough, the web browser cannot display the ASP page.

This problem occurs because of an error in the Asp.dll module. When the ASP page tries to send a large response to the client, the number of elements exceeds the limit.

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may 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.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.


You must have Internet Information Services (IIS) 7.0 and the ASP IIS module installed to apply this hotfix. Additionally, your computer must be running Windows Vista SP2 or Windows Server 2008 SP2

Restart requirement

You must restart the computer after you apply this hotfix if the Asp.dll file is being used. To avoid restarting the computer, stop all IIS services before you apply this hotfix. To stop all IIS services, open a command prompt, type the following command, and then press ENTER.
iisreset /stop

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.
For all supported x86-based versions of Windows Vista SP2 and of Windows Server 2008 SP2
File nameFile versionFile sizeDaTeTimePlaTform
For all supported x64-based versions of Windows Vista SP2 and of Windows Server 2008 SP2
File nameFile versionFile sizeDaTeTimePlaTformSP requiremenTService branch
For all supported IA-64-based versions of Windows Server 2008 SP2
File nameFile versionFile sizeDaTeTimePlaTformSP requiremenTService branch
To work around this issue, decrease the response size by limiting the number of HTML elements in the ASP page.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the Response.Flush Method, visit the following Microsoft Developer Network (MSDN) website: For more information about the how to deply a classic ASP server, visit the following Microsoft Technet website: For more information about software update terminology, 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

Article ID: 981277 - Last Review: 12/12/2015 03:41:38 - Revision: 3.0

Microsoft Internet Information Services 7.0

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