User is not available in this context - error generated after upgrading ASP.Net MVC app to .Net 4.0?

May have something to do with your web.config. Create a new MVC 2 project and compare the web. Config with your existing web.config.

I'm not familiar with those handlers, but based on the error it seems that it could work if you change the Application Pool to run under Classic Mode. Not sure if there is a better fix, but from the message it looks like its accessing User too early which only happens when you are running in Integrated Mode.

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