On server operating systems, install the HTTP Activation feature using Windows Server Manager. Right-click Features and select ...

On server operating systems, install the HTTP Activation feature using Windows Server Manager. Right-click Features and select Add Features. Under .NET Framework 3.0 features, ensure that HTTP Activation is selected.

On client operating systems, install this feature using Programs and Features Control Panel > Turn Windows features on or off. Under Microsoft .NET Framework 3.5.1, ensure that the Windows Communication Foundation HTTP Activation option is selected.

If the client operating system is Windows 8 or later, you must also make sure that the HTTP Activation option is selected under .NET Framework 4.5 Advanced Services > WCF Services.

In addition, make sure that a restart is not pending for the computer.

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