On my PC, I have updated to .NET Framework 4.0 for my Web project. The Web site works well. However, on the server, I have also installed .NET Framework 4.0, changed the Web site to point to 4.0 and I obtain The page cannot be found. I see also that I cannot access the ASP.NET properties by the use of "Edit Global Configuration" and "Edit Configuration" as those two options are disabled when I select 4.0. Does anyone know what I am missing to have the Web site compiled under 4.0 to start working?