how to use our own 404 file not found error page in MOSS environment. The following example catches the 404 error and sends users to a redirect page.
Here's the steps:
1. In your MOSS server, make a copy of
%systemdrive%\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\TEMPLATE\LAYOUTS\1033\sps404.html
and call it my404.html
2. Create a Virtual Directory in IIS under your MOSS root web application. For example /errors
3. Create your own redirect aspx page, for example /errors/my404redirect.aspx and code your redirect logic in there. This is a normal asp.net page.
4. In my404.html, make the following change:
STSNavigate("/errors/my404redirect.aspx?oldUrl=" + requestedUrl);
5. Create a Console Application and insert the following code and run it in MOSS server
System.Uri webApplicationUri = new Uri(http://MOSSServer/);
SPWebApplication webApplication = SPWebApplication.Lookup(webApplicationUri);
webApplication.FileNotFoundPage = "my404.html"; //*note
webApplication.Update();
*Note: By default this is set to null. FileNotFoundPage needs to point to a html file that lives in %systemdrive%\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\TEMPLATE\LAYOUTS\1033. The file needs to be html only.
6. Now when you browse to a page that doesn't exist, you should expect to be brought to the redirected page.
*Another note:
In IE there's a "Show friendly HTTP error messages" setting which is ON by default in Internet Options->Advanced. With this setting on, sometimes your custom error page is not displayed. In order to override this setting, both my404.html and /errors/my404redirect.aspx from the above steps need to be larger than 512 bytes in size. Refer to the following KB about this setting: http://support.microsoft.com/kb/218155
* This seems to be working within a site collection context only, i.e. http://MOSSServer/sites/siteA if sites is a wildcard inclusion managed path and siteA doesn't exist in MOSS then this URL will NOT trigger the custom 404 error page set to SPWebApplication.FileNotFoundPage property.
