I am trying to bind to the local Endpoint to start a asynchronous listener using the following code but get the following error.

The requested address is not valid in its context

I have used other bluetooth functionality within the InTheHand framework so my BT dongle is compatible.. 

What am I going wrong?

         BluetoothAddress BTAddress = BluetoothRadio.PrimaryRadio.LocalAddress;

         BluetoothEndPoint LocalEndPoint = new BluetoothEndPoint(BTAddress, _N2FServiceGUID, 100);

         BluetoothClient BTClient = new BluetoothClient();

        try
        {
            BTClient.Client.Bind(LocalEndPoint); <-- error occurs here
            BTClient.Client.Listen(100);

        }
 

The maximum RFCOMM port/channel number is 31, so either remove the last argument (100) from the BluetoothEndPoint constructor entirely, or change it to something less than 31.