Unable to cast object of type 'System.Security.Principal.GenericPrincipal' to type 'System.Security.Principal.WindowsPrincipal'

When accessing an IIS web page you may see the error

Unable to cast object of type 'System.Security.Principal.GenericPrincipal' to type 'System.Security.Principal.WindowsPrincipal'

This can be due to the Windows Authentication role service not being installed.

This can be found in Server Manager on server operating systems from Windows 2008 and above, or on desktop operating system goto

Control Panel > Programs and Features > Turn Windows features on or off


Screenshot: Enable Windows authentication on Windows 8



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