I get this email a lot from beginners……..

Where is the machine.config file ?

As we’ve simplified the we.config file some configuration elements have been moved lower in the chain to the machine.config file.

The machine.config file is located in

[Your System Drive]:\<windows>\Microsoft.NET\Framework\<version>\config\machine.config

On my laptop the real path is :

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config

For more information on the ASP.NET configuration hierarchy [ read HERE ]