ASP.NET MVC 2 & IIS : HTTP 500.24 favicon.ico Error - iis

Question

I have a little weird behavior with my ASP.NET MVC 2 application.
I'm using IIS 7.5, Windows Authentication and ASP.NET Impersonation for my webpage to load.
After several searches, I didn't found a nice way to get rid of the 500.24 Request that I keep getting on every page load (The favicon.ico at the root directory triggers this) :
I've looked at some articles like this one or that one but this doesn't seems to solve my issue. I need these settings on for my application to work here : .NET 4 Framework Integrated Mode pipeline, Windows Authentification and ASP.NET Impersonation.
Here's a simplified version of my web.config, if it can help anyone (of course, I've removed the connections strings for security reasons..)
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<system.web>
<customErrors mode="Off" />
<identity impersonate="true" />
<compilation debug="true" targetFramework="4.0">
<assemblies>
<add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<add assembly="System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
<add assembly="System.Data.Entity.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
</assemblies>
</compilation>
<authentication mode="Windows">
<!-- roleManager enabled="true" defaultProvider="AspNetWindowsTokenRoleProvider" / -->
<!-- forms loginUrl="~/Account/LogOn" timeout="2880" / -->
</authentication>
<membership>
<providers>
<clear />
<add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/Globe" />
</providers>
</membership>
<profile>
<providers>
<clear />
<add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/Globe" />
</providers>
</profile>
<roleManager enabled="false">
<providers>
<clear />
<add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/Globe" />
<add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/Globe" />
</providers>
</roleManager>
<pages>
<namespaces>
<add namespace="System.Web.Mvc" />
<add namespace="System.Web.Mvc.Ajax" />
<add namespace="System.Web.Mvc.Html" />
<add namespace="System.Web.Routing" />
</namespaces>
</pages>
</system.web>
<system.webServer>
<httpProtocol>
<customHeaders>
<add name="X-UA-Compatible" value="IE=edge" />
</customHeaders>
</httpProtocol>
<validation validateIntegratedModeConfiguration="false" />
<modules runAllManagedModulesForAllRequests="true">
<remove name="WebDAVModule" />
</modules>
<security>
<requestFiltering>
<verbs>
<add verb="PUT" allowed="true" />
<add verb="DELETE" allowed="true" />
</verbs>
</requestFiltering>
</security>
</system.webServer>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0" newVersion="2.0.0.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
<system.serviceModel>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true" />
</system.serviceModel>
</configuration>
My application IS working, the favicon.ico IS loading, I'm just wondering why it does fires a 500.24 on every request (Of course, maybe it's Fiddler who can't authenticate itself and causes de 500.24 HTTP Error, but when it does normally it triggers a 401.2 - Unauthorized instead...)

Answer 1

My guess is that favicon.ico is either running in a different application pool, or there is a web.config in the root of the site that has issues.
So:
1) Check to see if the root of the site (the directory where /favicon.ico lives) includes a web.config. If it does, then check to see if it is setting a system.web/httpModule, or httpHandler, or system.web/identity (impersonate) or something like that, and the application pool is running in integrated mode.
So what you need to do is either remove the offending httpmodule/httphandler/impersonate setting, or change the application pool to run as classic, or add the same configuration your site includes which is <validation validateIntegratedModeConfiguration="false" />

Answer 2

What CarlosAg said. Cheap fix might be to move the favicon into the offended app rather than barking up the tree.

Answer 3

I did find the answer to my problem =)
You're gonna laugh at me, for sure.. =P
Well, part of the answer is the <validation validateIntegratedModeConfiguration="false" /> in the C:\inetpub\wwwroot that CarlosAg pointed out, but the other part was that I simply forgot to add the <link rel="icon" href="<%: Url.Content("~/favicon.ico")%>" type="image/x-icon" /> to my Site.Master file in my ASP.NET MVC 2 Application. Since Chrome and IE does look at the root directory for a favicon.ico, it appeared to work, but I didn't notice until now that Firefox wasn't loading up the favicon.
Now the favicon loads on every browser, and there is no 500.24 HTTP Request sent over in Fiddler.
Thanks ! =)