Error when Authentication selected in iis7


"Configuration section not allowed to be set below application" error when Authentication selected in iis7 on 3 exchange folders
 
"There was an error performing this operation."

"Filename: \\?\C:\Program Files\Microsoft\Exchange Server\v14\ClientAccess\owa\web.config"

"Error: Configuration section not allowed to be set below application."
Exchange 2010 SP2, IIS 7

When accessing the Exchange or Exchweb folder and clicking on Authentication the error appears.

Backup the file by right clicking, select copy, then right click in the folder and select paste.

In the OWA web.config file remove ” <authentication mode="Windows" />”.

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