Page cannot be served HTTP Error 404.3 - Not Found

Question

I'm new in IIS, I have asp web applications, and I must add them to the default web site, and when I run default web site, it's fine, but when I run the applications I receive the error: "HTTP Error 404.3 - Not Found" "The page you are requesting cannot be served because of the extension configuration. If the page is a script, add a handler. If the file should be downloaded, add a MIME map."

In server roles I have:

In server Features I have:

I have tried to register aspnet components: C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319> .\\aspnet_regiis.exe -ir

but I recieve this message: "This option is not supported on this version of the operating system. Administrators should instead install/uninstall A SP.NET 4.5 with IIS8 using the Turn Windows Features On/Off dialog"

I tried this too: C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319> .\\ServiceModelReg.exe -ia and C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319> .\\ServiceModelReg.exe -ir but I recieve this message:

[Error]This tool is not supported on this version of Windows. Administrators should instead install/uninstall Windows Communication Foundation features using the 'Turn Windows Features On/Off' dialog....

I have windows server 2012 and this IIS version:

I can't remove or uninstall IIS, because this is our customer server and they uses the default web site for their Application and myapplications must run in that web site.

What can I do?? I hope somebody please help me.

Best Regards

Answer 1

404.3 means there is a MIME type restriction, meaning that the IIS server will not handle files with whatever type of files you are trying host. The handler has to defined under Handler Mappings (should be under your website).

Click Add Module Mapping and add the type of the file extension.