Why is my ClaimsIdentity IsAuthenticated always false (for web api Authorize filter)?

Why is my ClaimsIdentity IsAuthenticated always false (for web api Authorize filter)?

c# asp.net asp.net-web-api claims-based-identity asp.net-4.5

asp.net

Using Grunt, Bower, Gulp, NPM with Visual Studio 2015 for a ASP.NET 4.5 Project

asp.net gulp bower visual-studio-2015 asp.net-4.5

asp.net

Build ASP.NET 4.5 without Visual Studio on Build Server

asp.net msbuild visual-studio-2012 asp.net-4.5 build-server

asp.net

Bundling resources via bundle.config vs BundleConfig.cs in ASP.NET 4.5 WebForms

asp.net webforms asp.net-4.5

asp.net

User.Identity.IsAuthenticated is false after successful login

c# asp.net asp.net-membership asp.net-4.5

asp.net

requestValidationMode 4.5 vs 2.0

asp.net asp.net-4.5

asp.net

Type definition exists in two libraries

c# asp.net webforms asp.net-4.5

asp.net

Failed to load viewstate. The control tree into which viewstate is being loaded

asp.net .net umbraco .net-4.5 asp.net-4.5

asp.net

System.Web.Security.AntiXss.AntiXssEncoder vs Microsoft.Security.Application.AntiXssEncoder

asp.net asp.net-4.5 antixsslibrary

asp.net

How to use System.Web.Caching in asp.net?

c# asp.net caching asp.net-4.5

asp.net

AspNetSession layout renderer not working

asp.net logging nlog asp.net-4.5

asp.net

typescript for web forms

asp.net webforms typescript asp.net-4.5

asp.net

MVC 3 System.Web.Optimization Bundles single file

asp.net asp.net-mvc-3 bundle asp.net-4.5 asp.net-optimization

asp.net