web.config not forwarding to 404 error page on non .aspx pages

Question

Objective

I want all URLs of missing pages to forward to my 404 page which is in my root as 404error.aspx

Problem

So far only the UR

Answer 1

You need to configure the element. This configures the error pages for both static files and server pages.

Your 3rd attempt "web.config (3)" and "Edit 1" are almost there. The problem is that you can't use app-relative paths here (ex: "~/404.html"), they have to be relative from the site root (ex: "/404.html").