ASP.NET Performance Profiling 404/500 errors

Using the Visual Studio Performance Explorer, with Cassini, I'm trying to launch profiling on my (Orchard CMS 1.4.0) ASP.NET MVC3 application, but I get this error: The web site could not be configured correctly; getting ASP.NET process information failed. Requesting `http://localhost:30320/OrchardLocal/VSEnterpriseHelper.axd` returned an error: The remote server returned an error: (404) Not Found. So I searched for a solution and found this article which didn't apply, because I'm using Visual Studio's development server (Cassini) not IIS - no less IIS 6. Then I read this article and this article; of all those suggestions, the only one that made a difference was adding the `location` section to my web.config, to grant access to VSEnterpriseHelper.axd. But as one of those articles predicted, my 404 error simply became a 500: The web site could not be configured correctly; getting ASP.NET process information failed. Requesting `http://localhost:30320/OrchardLocal/VSEnterpriseHelper.axd` returned an error: The remote server returned an error: (500) Internal Server Error. The trailing commentaries in these various articles aren't working for me. Any suggestions? I figure I will post my (Orchard 1.4.0) web.config here, in case somebody can spot a culprit: ``` <?xml version="1.0"?> <!-- Note: As an alternative to hand editing this file you can use the web admin tool to configure settings for your application. Use the Website->Asp.Net Configuration option in Visual Studio. A full list of settings and comments can be found in machine.config.comments usually located in \Windows\Microsoft.Net\Framework\v2.x\Config --> <configuration> <configSections> <sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor"> <section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection, System.Web.WebPages.Razor" requirePermission="false" /> <section name="pages" type="System.Web.WebPages.Razor.Configuration.RazorPagesSection, System.Web.WebPages.Razor" requirePermission="false" /> </sectionGroup> <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" requirePermission="false" /> </configSections> <appSettings> <add key="webpages:Enabled" value="false" /> <add key="log4net.Config" value="Config\log4net.config" /> </appSettings> <!-- Added this, which eliminated the profiling VSEnterpriseHelper.axd 404 error - and led to a 500 error instead. --> <location path="VSEnterpriseHelper.axd"> <system.web> <authorization> <allow users="*"/> </authorization> </system.web> </location> <system.web.webPages.razor> <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> <pages pageBaseType="Orchard.Mvc.ViewEngines.Razor.WebViewPage"> <namespaces> <add namespace="System.Web.Mvc" /> <add namespace="System.Web.Mvc.Ajax" /> <add namespace="System.Web.Mvc.Html" /> <add namespace="System.Web.Routing" /> <add namespace="System.Web.WebPages" /> <add namespace="System.Linq"/> <add namespace="System.Collections.Generic"/> <add namespace="Orchard.Mvc.Html"/> </namespaces> </pages> </system.web.webPages.razor> <!-- Set default transaction timeout to 30 minutes so that interactive debugging is easier (default timeout is less than one minute) --> <system.transactions> <defaultSettings timeout="00:30:00"/> </system.transactions> <system.web> <!--<trust level="Medium" originUrl="" />--> <httpRuntime requestValidationMode="2.0" /> <!-- Set compilation debug="true" to insert debugging symbols into the compiled page. Because this affects performance, set this value to true only during development. --> <compilation debug="true" targetFramework="4.0" batch="true" numRecompilesBeforeAppRestart="250" optimizeCompilations="true"> <buildProviders> <add extension=".csproj" type="Orchard.Environment.Extensions.Compilers.CSharpExtensionBuildProviderShim"/> </buildProviders> <assemblies> <add assembly="System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"/> <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"/> <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"/> <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/> <remove assembly="System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" /> <remove assembly="System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" /> <remove assembly="System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> <remove assembly="System.Web.Services, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" /> <remove assembly="System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> <remove assembly="System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" /> <remove assembly="System.EnterpriseServices, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" /> <remove assembly="System.IdentityModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> <remove assembly="System.Runtime.Serialization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> <remove assembly="System.ServiceModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> <remove assembly="System.ServiceModel.Activation, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/> <remove assembly="System.ServiceModel.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/> <remove assembly="System.Activities, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/> <remove assembly="System.ServiceModel.Activities, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/> <remove assembly="System.WorkflowServices, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/> <remove assembly="System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> <remove assembly="System.Data.DataSetExtensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> <remove assembly="System.Web.ApplicationServices, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> </assemblies> </compilation> <!-- The <authentication> section enables configuration of the security authentication mode used by ASP.NET to identify an incoming user. --> <authentication mode="Forms"> <forms loginUrl="~/Users/Account/AccessDenied" timeout="2880"/> </authentication> <!-- The <customErrors> section enables configuration of what to do if/when an unhandled error occurs during the execution of a request. Specifically, it enables developers to configure html error pages to be displayed in place of a error stack trace. --> <customErrors mode="RemoteOnly" /> <pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID"> <namespaces> <add namespace="System.Web.Mvc"/> <add namespace="System.Web.Mvc.Ajax"/> <add namespace="System.Web.Mvc.Html"/> <add namespace="System.Web.Routing"/> <add namespace="System.Linq"/> <add namespace="System.Collections.Generic"/> <add namespace="Orchard.Mvc.Html"/> </namespaces> </pages> <httpHandlers> <!-- see below --> <clear /> <add path="*" verb="*" type="System.Web.HttpNotFoundHandler"/> </httpHandlers> <httpModules> <add name="WarmupHttpModule" type="Orchard.WarmupStarter.WarmupHttpModule, Orchard.WarmupStarter, Version=1.0.20, Culture=neutral"/> </httpModules> </system.web> <!-- The system.webServer section is required for running ASP.NET AJAX under Internet Information Services 7.0. It is not necessary for previous version of IIS. --> <system.webServer> <validation validateIntegratedModeConfiguration="false" /> <modules runAllManagedModulesForAllRequests="true"> <remove name="WarmupHttpModule" /> <add name="WarmupHttpModule" type="Orchard.WarmupStarter.WarmupHttpModule, Orchard.WarmupStarter, Version=1.0.20, Culture=neutral"/> </modules> <handlers accessPolicy="Script"> <!-- clear all handlers, prevents executing code file extensions, prevents returning any file contents --> <clear/> <!-- Return 404 for all requests via managed handler. The url routing handler will substitute the mvc request handler when routes match. --> <add name="NotFound" path="*" verb="*" type="System.Web.HttpNotFoundHandler" preCondition="integratedMode" requireAccess="Script"/> </handlers> <!-- Prevent IIS 7.0 from returning a custom 404/500 error page of its own --> <httpErrors existingResponse="PassThrough" /> </system.webServer> <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <probing privatePath="App_Data/Dependencies"/> <dependentAssembly> <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35"/> <bindingRedirect oldVersion="1.0.0.0" newVersion="3.0.0.0"/> <bindingRedirect oldVersion="2.0.0.0" newVersion="3.0.0.0" /> </dependentAssembly> </assemblyBinding> </runtime> </configuration> ```