How to lift the stealth firewall settings

I use local area network, there is a kid with a firewall to address the stealth, with detection tools can not find the address.He tried to download and how to solve?

you a loaded situation, with the good, with ARP.mounted in mind before the system shut down the firewall, the firewall or other disposal.”network scissors in hand,” I was with BT on the death of his automatic card network Speed, and then do not have to go to the trouble of ip beat him