No , i can't tell wich port or what protocol , this is infact what i like to know. The test was telling me the hidden server was enabled and running , and it showed me a warning. Maybe Cluberti , you can visit grc.com and check for yourself and see how YOUR system is doing. This will make my question more clear once you do the test yourself. Port 443 is closed and the other two tests showed my system as " stealth ". Edit : you can find the test in : services - shields up. I tested the Files sharing - Common ports and all services ports.