I have to emphasise this possible solution if you come to a problem with ASP.NET 4.0 Web Form Routing. I guess there might be other reasons but in my case it was just this tiny bit:  Enable HTTP Redirection Feature under Windows Features -> Internet Information Services -> Word Wide Web services -> Common HTTP Features I had to spend many hours to find the solution, thank you clever guys from Microsoft he he Solution found here: http://forums.asp.net/t/1523639.aspx by Remy [...]

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