WCF, IIS, and ASP.NET must be installed for IIS-hosted WCF services to function correctly. The procedures for installing WCF (as part of the .NET Framework 3.0), ASP.NET and IIS vary depending on the operating system version being used. For more information about installing WCF and the .NET Framework 3.0, see Microsoft .NET Framework 4.0 Web Installer. Instructions for installing IIS can be found at Installing IIS.

The installation process for the .NET Framework 3.0 automatically registers WCF with IIS if IIS is already present on the machine. If IIS is installed after the .NET Framework 3.0, an additional step is required to register WCF with IIS and ASP.NET. You can do this as follows, depending on your operating system:

• Windows XP SP2 and Windows Server 2003: Use the ServiceModel Registration Tool (ServiceModelReg.exe) tool to register WCF with IIS: To use this tool, type ServiceModelReg.exe /i /x in the Visual Studio command prompt. You can open this command prompt by clicking the start button, selecting All Programs, Microsoft Visual Studio 2010, Visual Studio Tools, and Visual Studio Command Prompt (2010).
• Windows Vista: Install the Windows Communication Foundation Activation Components subcomponent of the .NET Framework 3.0. To do this, in Control Panel, click Add or Remove Programs and then Add/Remove Windows Components. This activates the Windows Component Wizard.

Finally you must verify that ASP.NET is configured to use the .NET Framework version 4.0. You do this by running the ASPNET_Regiis tool with the –i option. For more information, see ASP.NET IIS Registration Tool

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