KB ID 0001333
When trying to enable an IP to ‘Relay’ though my Exchange server, I found I was unable to select ‘Frontend TransportConnector’.
Apparently this is a a bug first seen in CU2, the only current fix is to either create the connector as a Hub Transport connector, then convert it using PowerShell, or create the connector in the Exchange Management Shell, which is what I did.
New-ReceiveConnector -Name “Allow-Relay-Connector” -Bindings ("0.0.0.0:25") -RemoteIPRanges ("192.168.100.100”) -MaxMessageSize 20MB –TransportRole FrontendTransport -Usage Custom –Server PNL-MAIL
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