Lync Server 2010, Response Group Service was not able to start the collaboration platform. An exception occurred when the ...

Lync Server 2010, Response Group Service was not able to start the collaboration platform.

An exception occurred when the collaboration platform was started.
This can occur if another application is already listening on port %1.
Exception: %2
Inner Exception: %3
Lync Server 2010, Response Group Service will stop.
Cause: Another application is using the same port.
Resolution:
Verify that the specified IP address is valid and that no other program is listening on the specified port.