A number of current firewalls pass the Shields Up tests (Comodo, Online Armor, etc.) with a direct internet connection. When I install my NAT Router (DLink EBR-2310) ahead of my software firewall, Shields UP 'Common Ports' test reports 'Failed' - because Port 113 is reported as closed, rather than stealthed. Perhaps I'm simply ignorant (thus my request for help), but is my internet security really compromised simply by making my router port 113 visible? Thanks for your help!