Not able to add permissions to exchange 2013 relay connector created on CAS Server

Hi Friends,

Here is the scenario.

I want to relay emails from WebServer (Placed on Internet) from Exchange 2013 SP1 CAS Server, but when I am trying to add permissions I am getting following error message, Connector Not Found, CMD looks connector on MB Server (Highlighted in Blue), whereas I have added Connector on CAS Server, please help me to troubleshoot the issue.

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Best Regards, Ranjit Singh