C:\Program
Files\Exchange Server\V14\Client Access\exchweb\ews\web.config
In the bottom of this file, you needed to change IsEnabled=”false” to IsEnabled=”true” then save the file and restart the Exchange MRS
service.
Set-WebServicesVirtualDirectory -Identity “EWS
(Default Web Site)” -MRSProxyEnabled $true –MRSProxyMaxConnections 100
