I want to block all ports except 80 on one pc in my house. I have a Linksys WCG200 gateway. It has a tab for blocking ports (Filtering Traffic) but the manual states that if I enable this for an IP address it blocks all traffic. This makes no sense to me. But if I setup to block all but port 80 then that single pc cannot access the web either. Can someone please explain how to do this so that the pc can access the web and all other ports blocked?