I am running httpd ( apache ) 2.0 and for some reason it wont work right on port 20 . It works fine on port 81 though . I can connect to the server from LAN on port 80 but WAN cannot access it on port 80 . I am using dyndns.org's services . I have port forwarding set up on my router . I had it set up correctly for port 81 and when I tried port 80 I just changed the number of the port and let all the other settings the same . Is there another feature in my router that I need to mess with ?