ASP.NET/IIS: 404 for all file types

Question

I set up 404 handler page in web.config, but it works ONLY when extension of URL is .aspx (or other which is handled by ASP.NET). I know I can setup static HTML page in webs

Answer 1

1. You can setup wild card mapping in IIS (Application configuration/Mappings/Wildcard mappings/ - just set aspnet_isapi.dll as executable and uncheck the Verify that file exists box) that will route all incoming requests to your app - so you can control the behavior directly from it.

2. You don't have to setup static page in your IIS application settings. Imho, you should be able to setup valid url (e.g. /error_handler.aspx) from your app that will be used as landing page in case of specific server error.