When you see this error on Edge Transport servers you have to examine the error description to determine where the mismatch occurs. In the example above, the connector in error is the "Default internal receive connector MAILGATE", which is the receive connector that exists on the Edge server itself. If the connector in error is on the "EdgeSync - Inbound to domain" connector, the mismatch is on the Hub Transport server's receive connector.
- On the Edge server, open the Exchange Management Console.
- Navigate to Microsoft Exchange > EdgeTransport.
- Click the Receive Connectors tab to view the existing connectors.
- Double-click the Default internal receive connector SERVER connector to view its properties.
To reconfigure the Hub Transport's Send Connector: