Custom 404 error page not working on IIS 8.5

Question

I have recently moved host and have had to set up Customer Errors again in IIS.

I can go to IIS Admin and Error Pages as follows:

Then I can go to the Custom Errors, and have set up the options as follows:

That creates my web.config file as follows:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <httpErrors errorMode="DetailedLocalOnly" defaultResponseMode="ExecuteURL">
            <remove statusCode="500" subStatusCode="100" />
            <remove statusCode="500" subStatusCode="-1" />
            <remove statusCode="404" subStatusCode="-1" />
            <error statusCode="404" prefixLanguageFilePath="" path="/error_404.asp" responseMode="ExecuteURL" />
            <error statusCode="500" prefixLanguageFilePath="" path="/error_500.asp" responseMode="ExecuteURL" />
            <error statusCode="500" subStatusCode="100" path="/error_500.asp" responseMode="ExecuteURL" />
        </httpErrors>
    </system.webServer>
</configuration>

When I test the pages, the 505 error works fine, and redirects to the right page, but the 404 doesn't redirect and returns the standard IIS 404 error. I have confirmed that the 404 error page is in place on the server in the correct location.

I can't see what else I need to do.

Answer 1

Got it working in the end (helped by finding this: http://forums.iis.net/t/1173965.aspx), using:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <httpErrors errorMode="Custom" defaultResponseMode="ExecuteURL">
            <remove statusCode="500" subStatusCode="100" />
            <remove statusCode="500" subStatusCode="-1" />
            <remove statusCode="404" subStatusCode="-1" />
            <error statusCode="404" path="/error_404.asp" responseMode="ExecuteURL" />
            <error statusCode="500" prefixLanguageFilePath="" path="/error_500.asp" responseMode="ExecuteURL" />
            <error statusCode="500" subStatusCode="100" path="/error_500.asp" responseMode="ExecuteURL" />
        </httpErrors>
    </system.webServer>
</configuration>