FIX: A client cannot determine whether a chunked HTTP response is completed when the connection is closed before the response is completely sent to the client

Consider the following scenario:
  • In the Microsoft .NET Framework 2.0, a client sends a request to a server by using the HttpWebRequest class.
  • The server sends an HTTP response to the client by using chunked transfer coding.
  • The connection is closed before the chunked HTTP response is completely sent to the client. For example, the connection is closed when a network error occurs or when the server is restarted.
In this scenario, the client cannot determine whether the chunked HTTP response is completed.

Note A chunked HTTP response is completed when the last chunk is sent to the client. The length of the last chunk is 0 (zero).

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 .NET Framework 2.0 service pack 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 the .NET Framework 2.0 installed to apply this hotfix.

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.
The .NET Framework 2.0, x86-based versions
File nameFile versionFile sizeDateTimePlatform
The .NET Framework 2.0, x64-based versions
File nameFile versionFile sizeDateTimePlatform
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
After you apply this hotfix, the following exception is thrown on the client if the connection is closed before the chunked HTTP response is completely sent to the client:
System.Net.WebException: The request was aborted: The connection was closed unexpectedly at System.Net.ConnectStream.Read(Byte[] buffer, Int32 offset, Int32 size)
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: 936464 - Last Review: 10/08/2011 17:53:00 - Revision: 3.0

Microsoft .NET Framework 2.0

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