Good evening everyone. I am playing Final Fantasy XI on my laptop and I am getting an FFXI-4001 error, which has been identified as a problem pertaining to my router. Because of my router model, I am being told that to fix this problem, the only way is to turn off the DMZ on my router. I would like to know what DMZ does and what consequences this will have for my laptop and pc using internet through it. Thank you for your time, have nice day.