This procedure only applies to Windows Server 2012 R2. These roles and features are applied automatically in Windows Server 2008 R2.
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Start the Server Manager on your machine.
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In the menu on the left, select the server to administer. This is most likely Local Server.
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In the menu at the upper right of the Roles and Features section, select Add Roles and Features.
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Click Next until the Features option in the menu on the left is highlighted, and then click Features.
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Click the arrow to expand .NET Framework that matches the version you installed during the Install the API procedure or the version previously installed.
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Select the ASP.NET check box.
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Click the arrow to expand the .WCF Services under .NET Framework.
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Select the HTTP Activation check box. You can also add non-HTTP types, such as Named Pipe and TCP, if you need them.
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Click Install.
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After the services have been installed, reboot the system for the changes to take effect.