FIX: .NET Framework 4-based WCF service may crash when many client web applications access the service if the TCP protocol is used

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Article ID: 2527387 - View products that this article applies to.
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SYMPTOMS

Consider the following scenario:
  • You host a Microsoft .NET Framework 4-based Windows Communication Foundation (WCF) service. The WCF service uses the TCP protocol.
  • Many client web applications use the WCF service.
  • The service tries to clean up some connections.
In this scenario, the WCF service may encounter a System.Net.InternalException exception and then crash. Additionally, you receive the following error message when this exception is encountered:
An error occurred within Windows Communication Foundation. Applications should not attempt to handle.
Or, the WCF service may encounter a System.NullReferenceException exception and then crash. Additionally, you receive the following error message when this exception is encountered:
Object reference not set to an instance of an object.

CAUSE

This issue occurs because of a shared variable between two threads does not have a lock for exclusive access.

While one thread processes client requests and calls the BeginReceive method, another thread may close some connections. For example, another thread may close some connections if it performs an application level verification. However, the BeginReceive and Abort methods access a shared variable for the same connection at the same time. Therefore, the issue that is described in the "Symptoms" occurs.

RESOLUTION

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

Prerequisites

To apply this hotfix, you must have the Microsoft .NET Framework 4 installed.

Restart requirement

You must restart the computer after you apply this hotfix if the affected files are being used.

We recommend that you close all .NET Framework applications before you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

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 XP, of Windows Server 2003, of Windows Vista, of Windows Server 2008, and of Windows 7 
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File nameFile versionFile sizeDateTimePlatform
System.servicemodel.dll4.0.30319.4506,100,32801-Apr- 201112:26x86
For all supported x64-based versions of Windows XP, of Windows Server 2003, of Windows Vista, of Windows Server 2008, of Windows 7, and of Windows Server 2008 R2 
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
System.servicemodel.dll4.0.30319.4506,100,32801-Apr- 201112:26x64
For all supported IA-64based versions of Windows Server 2003, of Windows Server 2008, and of Windows Server 2008 R2 
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
System.servicemodel.dll4.0.30319.4506,100,32801-Apr- 201112:26IA-64

STATUS

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

Properties

Article ID: 2527387 - Last Review: June 3, 2011 - Revision: 2.0
APPLIES TO
  • Microsoft .NET Framework 4
Keywords: 
kbqfe kbhotfixserver kbfix kbexpertiseadvanced kbsurveynew KB2527387

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