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IIS is configured in the Windows Server Manager application. It is configured in the IIS (WebServer) role. There are a number of elements to the configuration. Many of the are selected automatically when you activate the IIS role and some need to be selected manually. The following images illustrate that setting that must be enabled for Versago and Bizweaver. Your IIS page may differ slightly from this illustration depending on the version of Windows & IIS being used.
Having HTTP Redirection enabled will allow you to use the “short” URL as described here Appendix C –Starting Versago with a Simple URL
Confirm that ASP.NET components are installed. ASP.NET 3.5 and ASP.NET 4.5 (or higher) should be active.