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I found another question posted on here which provided a solution to the first part of my question, i.e. how to generate a 404 page in ASP.NET MVC WITHOUT redirecting to another page (so the originally requested url remains in the address bar). ASP.NET MVC - How to throw a 404 page similar to that on StackOverflow protected void Application_Error(object sender, EventArgs e) { var exception = Server.GetLastError(); Response.Clear(); var httpException = exception as HttpException; var routeData = new RouteData(); routeData.Values.Add("controller", "Error"); if (httpException != null) { routeData.Values.Add("action", httpException.GetHttpCode() == 404 ? "NotFound" : "Unknown"); // clear the error, otherwise, we will always get the default error page. Server.ClearError(); // call the controller with the route IController errorController = new ErrorController(); errorController.Execute(new RequestContext(new HttpContextWrapper(Context), routeData)); } } The 404 side of things works fine for me if I don't use an IOCControllerFactory, but as soon as I do use a factory, the error code in global.asax isn't used and instead I get the following error: The IControllerFactory 'MyNamespace.IOCControllerFactory' did not return a controller for the name 'blah'. How do I get around this, without resorting to getting rid of my controllerfactory, and creating a parameterless constructor for each of my controllers?

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