Hi, I'm restricting my server's access with some very simple rules (OUTPUT accept of default, my job only on INPUT initially drop of default) ... ... $ipt -A INPUT -p udp --s $router --sport 53 -j ACCEPT ... ... paying attention to DNS issues. But when my firewall is running, Firefox can't access internet at all (not only resolve names), while the other network trouble-shooting tools (ping, nslookup) are ok. Any advise? Thank you so much. Gionni