To customize 404 handling and based on the hosting company's suggestion, we are currently using the following web.config setup. However, we quickly realized that with this configuration, any page error (500 error) are also getting redirected to this custom error page. How can I modify this config file so we can continue to handle 404 with custom file while still able to view on-page error?

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.webServer>
<httpErrors errorMode="DetailedLocalOnly" defaultPath="/Custom404.html" defaultResponseMode="ExecuteURL">
<remove statusCode="404" subStatusCode="-1" />
<error statusCode="404" prefixLanguageFilePath="" path="/Custom404.html" responseMode="ExecuteURL" />
</httpErrors>
</system.webServer>
<system.web>
<customErrors mode="On">
<error statusCode="404" redirect="/Custom404.html" />
</customErrors>
</system.web>
</configuration>