My firewall log shows a lot of attempts by different people to Tracert my pc.The source and the destination ports are both 6346.This means that there's some trojan in my pc and the dumb lamer is using some canned client program.My dumb anti trojan software doesn't detect it.. Is there some way i can just stop all activities in a particular port (6346!) ?? or is there some really good and free antitrojan software ????