Puedes probar el programa PORTMON de www[punto]sysinternals[punto]com , la descripción dice:
Cita:
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Portmon is an application that lets you monitor serial and parallel activity on your local system, or any computer on the network that you can reach via TCP/IP. It is the most powerful tool available for tracking down port-related configuration problems and analyzing application port usage.
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No lo he probado, pero parece que es lo que necesitas...