FIX: No response when client requests are sent to an ASP.NET 4.0 website if the ARR module is used and if minResponseBuffer is set to a small value

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Article ID: 2619333 - View products that this article applies to.
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SYMPTOMS

Consider the following scenario:
  • You install the Microsoft Application Request Routing (ARR) 2.0 or ARR 2.5 module on a computer that is running Internet Information Services (IIS).
  • You set the Response buffer threshold (KB) setting to a value that is less than the default value. For example, you set the Response buffer threshold (KB) setting to 4.

    Notes
    • The Response buffer threshold (KB) setting can be configured on the Application Request Routing page.
    • The Response buffer threshold (KB) setting is the minResponseBuffer setting in the ApplicationHost.config file.
    • By default, the Response buffer threshold (KB) setting is set to 256.
  • The computer hosts an ASP.NET 4.0-based website. The website uses an ASP.NET application-level event handler.
  • The website receives many client requests.
In this scenario, some client requests may enter a not responding state. Therefore, no responses are sent to the clients of the requests that enter this state.

CAUSE

This issue occurs because of an error in ASP.NET 4.0.

RESOLUTION

To resolve this issue, apply the following hotfix on the computer that hosts the ASP.NET website.

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.

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, submit a request to 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
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

To apply this hotfix, you must have ASP.NET 4 installed.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

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 x86-based versions of the .NET Framework 4.0
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Aspnet_wp.exe4.0.30319.51232,59204-Oct-201102:47x86
Setup.dll10.0.30319.512295,76004-Oct-201102:47x86
Setupengine.dll10.0.30319.512809,30404-Oct-201102:47x86
Setupui.exe10.0.30319.51278,15204-Oct-201102:47x86
System.web.dll4.0.30319.5125,227,85604-Oct-201102:47x86
System.web.extensions.dll4.0.30319.5121,862,50404-Oct-201102:47x86
Webengine.dll4.0.30319.51214,16004-Oct-201102:47x86
Webengine4.dll4.0.30319.512495,44004-Oct-201102:47x86
For all supported x64-based versions of the .NET Framework 4.0
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Aspnet_wp.exe4.0.30319.51232,59204-Oct-201102:47x86
Aspnet_wp.exe4.0.30319.51240,78404-Oct-201103:16x64
Setup.dll10.0.30319.512295,76004-Oct-201102:47x86
Setupengine.dll10.0.30319.512809,30404-Oct-201102:47x86
Setupui.exe10.0.30319.51278,15204-Oct-201102:47x86
System.web.dll4.0.30319.5125,227,85604-Oct-201102:47x86
System.web.dll4.0.30319.5125,197,13604-Oct-201103:16x64
System.web.extensions.dll4.0.30319.5121,862,50404-Oct-201102:47x86
Webengine.dll4.0.30319.51214,16004-Oct-201102:47x86
Webengine.dll4.0.30319.51215,69604-Oct-201103:16x64
Webengine4.dll4.0.30319.512495,44004-Oct-201102:47x86
Webengine4.dll4.0.30319.512720,72004-Oct-201103:16x64
For all supported IA-64based versions of the .NET Framework 4.0
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Aspnet_wp.exe4.0.30319.51232,59204-Oct-201102:47x86
Aspnet_wp.exe4.0.30319.51280,20804-Oct-201103:46IA-64
Setup.dll10.0.30319.512295,76004-Oct-201102:47x86
Setupengine.dll10.0.30319.512809,30404-Oct-201102:47x86
Setupui.exe10.0.30319.51278,15204-Oct-201102:47x86
System.web.dll4.0.30319.5125,227,85604-Oct-201102:47x86
System.web.dll4.0.30319.5124,816,20804-Oct-201103:46IA-64
System.web.extensions.dll4.0.30319.5121,862,50404-Oct-201102:47x86
Webengine.dll4.0.30319.51214,16004-Oct-201102:47x86
Webengine.dll4.0.30319.51225,42404-Oct-201103:46IA-64
Webengine4.dll4.0.30319.512495,44004-Oct-201102:47x86
Webengine4.dll4.0.30319.5121,340,75204-Oct-201103:46IA-64

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

For more information about how to create ASP.NET application-level event handlers, visit the following MSDN website:
How to create ASP.NET application-level event handlers
For more information about the Proxy page of the ARR module, visit the following MSDN website:
General information about the Proxy page of the ARR module

Properties

Article ID: 2619333 - Last Review: October 28, 2011 - Revision: 1.0
APPLIES TO
  • Microsoft ASP.NET 4
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbexpertiseadvanced kbsurveynew KB2619333

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