ASP.Net Swallowing 404 Error

Question

So I've set up a rule in IIS7 to redirect to a specific page on a 404 error.

This works great as long as I'm typing URLs such as:

www.abc.com/Test/

However as soon as I attempt to access a file that doesn't exist

www.abc.com/Test/Test.aspx

I get the ASP.Net error message:

Server Error in '/' Application.

The resource cannot be found.

How can I keep ASP.Net from swallowing the 404 error and overriding my settings in IIS7?

EDIT: Here's my web.config file. IIS added the system.webServer stuff not me.

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.web>
        <customErrors mode="Off"/>
    </system.web>
    <system.webServer>
        <httpErrors>
            <remove statusCode="403" subStatusCode="-1" />
            <remove statusCode="404" subStatusCode="-1" />
            <error statusCode="404" prefixLanguageFilePath="" path="/redir.aspx" responseMode="ExecuteURL" />
            <error statusCode="403" prefixLanguageFilePath="" path="/redir.aspx" responseMode="ExecuteURL" />
        </httpErrors>
    </system.webServer>
</configuration>

have you changed the web.config error section to point to the same page? — nathan gonzalez
– nathan gonzalez, Commented Mar 15, 2011 at 3:51
You are probably better off doing the reverse and having ASP.Net handle all of your 404 errors. — Justin
– Justin, Commented Mar 15, 2011 at 4:21
As far as I understand it, ASP.Net can't catch 403 errors so unless someone can show me otherwise that isn't an option either. — Spencer Ruport
– Spencer Ruport, Commented Mar 15, 2011 at 4:47

joelt · Accepted Answer · 2011-03-15 04:01:23Z

1

If you're in Classic pipeline mode, you may be able to use the "Invoke handler only if request is mapped to file" option. I had to turn it on for two .aspx mappings--I think one was 32 bit and one was 64.

answered Mar 15, 2011 at 4:01

joelt

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1 Comment

Spencer Ruport Over a year ago

Ah, I figureed I'd have to do something hacky like that. Ugh.

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