ASP.NET aspxerrorpath in URL

Question

I have a site where I use CustomErrors in the web.config to specify a custom error page, and that\'s working just fine. The custom 404 page is also specified in the IIS con

Answer 1

You may have to add the below to web.config

<customErrors mode="On">
  <error statusCode="404" redirect="~/error404.aspx" />
</customErrors>

For more information check : http://geekswithblogs.net/shahed/archive/2007/10/23/116278.aspx

Update: We can utilize the IIS7 functionality for displaying custom 404 error pages using HTTPModules as described in http://professionalaspnet.com/archive/2008/02/13/Enforcing-a-Custom-404-Page-in-ASP.NET.aspx

Answer 2

The aspxerrorpath parameter is passed if the error was caught by .NET (and the error page specified in web.config is used). This happens if you're using the development web server, or if IIS is configured not to check that the file exists.

If IIS checks that the file exists, then the custom error configured in IIS is used, and the requested URL is included in the querystring as something like

http://example.com/FileNotFound.aspx?404;http://example.com/badpage.aspx