connection string not refering in the Machine.config

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ASP.NET4

I have migrated server windows 2003 to windows server 2008.

I have used all the connection string in machine.config only. This will be working in Windows server 2003.

After migrating of the server, Connection string not refering in Machine.config. I am getting below error.

Error:

"The connection name 'ConnEmp' was not found in the applications configuration or the connection string is empty."

It will take only web.config only.

But, i want to mention all my connection string in machine.config for security purpose.

what settings i want to do...?

pls. help....