In all my previous Custom Error posts Part 1, Part 2 and Part 3, I have configured a static file (.htm) for custom error. You can also configure a .asp or .aspx page for custom error. But remember you will see the custom error page for .htm or .asp pages only. Example, www.dotnetscraps.com/blah.htm or www.dotnetscraps.com/blah.asp will show the custom page but www.dotnetscraps.com/blah.aspx will still show the detailed error message. Today we will configure .net dynamic pages to show custom errors in IIS 7.5.

1. Click on the Web Site (Default Web Site in our case)
2. In Features View, double click on .NET Error Pages
3. Click Add…
4. Under Status Code: type 404
5. type an Absolute URL: e.g.: www.dotnetscraps.com/custerr/404.aspx
6. Click OK 
   
    
   
7. You can also set a default redirect to an error page for all status codes you haven’t explicitly configured
8. Click on Edit Feature Settings…
9. Under Absolute URL, type the URL e.g.: www.dotnetscraps.com/custerr/error.aspx 
   
   

Please refer the article customErrors Element (ASP.NET Settings Schema) to learn more about .NET customErrors.

My web.config:

<system.web><customErrors defaultRedirect="www.dotnetscraps.com/custerr/error.aspx" mode="RemoteOnly"><error redirect="www.dotnetscraps.com/custerr/404.aspx" statusCode="404" /></customErrors></system.web>

Hope this helps,
Vivek Kumbhar

Quote of the day:
I spent a lot of money on booze, birds and fast cars. The rest I just squandered. - George Best