IIS 404 Custom Error not working as expected

Question

I\'m working on IIS6, ASP.NET, VS2008. The web site uses a custom error handler to catch 404 errors and serve an alternate page. When presented with an url of the form:

Answer 1

ASP.Net has a custom errors configuraiton of its own.

Go to the ASP.Net configuration of your virtual directory (web application) and right-click -> ASP.Net -> Edit Configuration -> Custom Errors.