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Invalid ASP.NET MVC route should go to custom 404 page instead of Forms Authentication's login page before login

Is it possible to configure ASP.NET MVC 2 RC and FormsAuthentication to achieve the following? The below scenarios need to be played out before a user logs-in to the system.

Scenario 1 - The user navigates to "http://server/home/invalid-action". A custom 404 error page is displayed.

Scenario 2 - The user navigates to "http://server/invalid-controller". A custom 404 error page is displayed.

I am able to achieve Scenario 1 by using proper tag. In Scenario 2, the authentication/authorization system takes over and navigates the user to login page instead of displaying the custom error page.

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