lol, bhai g you cant set up ISA settings, ISA is the server which is installed @ your cable walas office, and even if you could access it you wont be able to make any changes to it, its a failry complex process which requires basic knowledge of networking and Security managment which i am guessing by your posts you dont have
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Also you'll only get banned from Live, your 360 will work ok offline you just wont be able to play online...