well again i only have 1 pc. and secondly i think the only thing there under DMZ is my computer name. According to Comcast at one point,they said i was supposed to remove my computer name by selecting "connected Computers" then click "add" on the right. those are the only thing i can do at DMZ on the page. nothing to click other then those 2 options. and it's true that the site you recommended said it was stealth. This is just complicated. i shouldn't be having this much trouble.
