You may receive an error saying
This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default (overrideModeDefault="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false".
This error may indicate that you have not installed ASP.NET 4.5. Check that you have done so int the server manager through "Add roles or features."