P5 definitely goes out and checks tcp/ip. I have lan and cable and even though i am running just the firefly render of something i developed on the laptop (not enough power to firefly on laptop) on my desktop... It knows if I am using laptop P5 at same time and shuts it down when the firefly render is complete. So during rendering doesnt check as soon as it is done it does - my firewall has not shown it attempting to look out to the net though.