I have XP pro clients, Cisco 4506 core, 3550/3560 edge switches all on\nEMI. What I want to do is block music sharing for itunes. I have read\nthat Itunes uses port 3369 and I have that blocked via an access list\nbut iTunes still can see and share libraries. I then ran a packet\nmonitoring program on my machine to see what other ports it had open.\nI found a few and blocked those and it just found more ports. Any\nideas on how to block this music sharing with itunes?\n\nThanks.