asp.net 3.5 custom error 404 not working for non aspx pages

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Hi all,I am working on a website which is developed in asp.net 3.5 , in which i have used following code to handle not existing pages

<customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">           
            <error statusCode="404" redirect="FileNotFound.htm" />
        </customErrors>

Now whwn I Type The url
e.g. http://mysite/Notexist.aspx

it redirects me to FileNotFound.htm

but when i type something like

e.g. http://mysite/Notexist.htm

it does not work it shows me the old iis page saying page not found..

i don't know why this does not working..

Please help me

Regards.

Posted 27-Nov-12 0:37am

anant_shetty

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Ankur^\m/ 27-Nov-12 8:39am

Hi... did the solution work for you?

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Ankur^\m/ · Answer 1 · 2012-11-27T01:21:00

That's because the request doesn't reach the ASP.NET engine and is handled by IIS itself. You will need to add a handler mapping to .htm pages.
For IIS 7, follow the following steps:

Open IIS and click on your website. Select 'Handler Mapping' from the right pane. There are 'Actions' listed on the extreme right and select 'Add Script Map'.
Enter *.htm in the Request Path field.
Give the path to aspnet_isapi.dll in the executable field. (Should be here: C:\Windows\Microsoft.NET\Framework\v2.0.50727\aspnet_isapi.dll. If it isn't here check Framework64 folder).
Finally give a name to the handler. Say Html.
Click Okay and try again now.

Hope this helps!