ASP.NET 4.0 application cannot find Default.aspx under IIS6

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I've got an ASP.NET 4.0 web application (webforms, not mvc; asp.net routing isn't used) that runs fine under IIS7. When I try to run it under IIS6 and navigate to http://localhost/MyApp/, I get the following exception:

File does not exist.
System.Web.HttpException
 at System.Web.StaticFileHandler.GetFileInfo(String virtualPathWithPathInfo, String physicalPath, HttpResponse response) (+0 IL, +2509040 JIT)
 at System.Web.StaticFileHandler.ProcessRequestInternal(HttpContext context, String overrideVirtualPath) (+54 IL, +198 JIT)
 at System.Web.DefaultHttpHandler.BeginProcessRequest(HttpContext context, AsyncCallback callback, Object state) (+263 IL, +347 JIT)
 at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() (+214 IL, +8967220 JIT)
 at System.Web.HttpApplication.ExecuteStep(HttpApplication.IExecutionStep step, Boolean& completedSynchronously) (+54 IL, +184 JIT)

Note that this output comes from my own custom error page. Thus, .NET itself is working fine. I can even remotely debug it and stuff.

Now, if I enter http://localhost/MyApp/Default.aspx, all works fine, I get the default page, etcetera. The first thought would be that the default document isn't specified in IIS, but it is. Even worse - if I disable it altogether, I still get the same error message (and yes, I restarted IIS and cleared my browser cache)!

It seems as if the request for / is always sent directly to ASP.NET which then gets confused because it doesn't have any default document concept. But I don't have any wildcard mappings defined, so how can that be?

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JayOnDotNet On BEST ANSWER

After Googling I found this one as a solution. Its unrelated but some commented its working. Can you please try this.

In the Windows registry, open the following node: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ASP.NET\4.0.30319.0

1.Create a new DWORD value named EnableExtensionlessUrls. 2.Set EnableExtensionlessUrls to 0. This disables extensionless URL behavior. 3.Save the registry value and close the registry editor. 4.Run the iisreset command-line tool, which causes IIS to read the new registry value