FIX: "System.NotSupportedException" exception occurs after you configure a "Negotiable 2-based" authentication provider on an IIS virtual directory that hosts a .NET Framework 3.5 SP1-based WCF service

Applies to: .NET Framework 3.5 Service Pack 1


Consider the following scenario:
  • You have a computer that is running Windows 7 or Windows Server 2008 R2.
  • You host a .NET Framework 3.5 Service Pack 1 (SP1)-based Windows Communication Foundation (WCF) service in an Internet Information Services (IIS) virtual directory on the computer.
  • You configure the IIS virtual directory to use a Negotiable 2-based authentication provider in IIS Manager.

    For example, you configure the IIS virtual directory to use the LiveSSP provider.
In this scenario, a System.NotSupportedException exception occurs, and then you receive the following error message. Therefore, the WCF services might not respond.
Description: An unhandled exception occurred during the execution of the current web request.
The authentication scheme 'Negotiate:LiveSSP' is not supported.

If you run Microsoft Exchange Server that uses the WCF service, various issues may occur. For example, the service encounters a ServiceModel.Activation exception, and then you receive the following message:
WebHost failed to process a request.


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: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.


No prerequisites are required to apply this hotfix.

Restart requirement

You do not have to restart the computer after you install the 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.

For all supported x86-based versions of Windows 7
File nameFile versionFile sizeDateTimePlatform
For all supported x64-based versions of Windows 7 or of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
For all supported IA-64-based versions of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform


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