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FIX: An exception occurs when a Web application that is based on the .NET Framework 2.0 uses the HttpWebRequest class and receives an HTTP 1.0 response that contains the HTTP status code 401

Consider the following scenario. You have a Web application that is based on the Microsoft .NET Framework 2.0. The Web application uses the HttpWebRequest class. A Web server sends an HTTP 1.0 response that contains the HTTP status code 401. The Web application receives the response. In this scenario, the HttpWebRequest class does not completely read the response body. Additionally, an exception occurs, and you receive the following error message in the Web application:
The server committed a protocol violation
This problem occurs when the response is split into the following parts:
  • The HTTP headers in the first response packet
  • The response body in the second response packet

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 global 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, Itanium architecture versions
File nameFile versionFile sizeDateTimePlatform
The .NET Framework 2.0, x64-based versions
File nameFile versionFile sizeDateTimePlatform
To work around this problem, force the Web server to send the response by using the HTTP 1.1 protocol.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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
HttpWebRequest HTTP 1.0 Protocol Violation

Article ID: 948887 - Last Review: 10/08/2011 09:24:00 - Revision: 2.0

  • Microsoft .NET Framework 2.0
  • kbfix kbexpertiseadvanced kbqfe KB948887