Hi I ran pcflank stealth test for firewall and it seems no matter what firewall I use (tested many) and even the mighty comodo firewall set to highest setting in the test keep showing the TCP FIN Packed as non-stealth. I do not know what tcp fin does and what port and how to stealth against it. here is pcflank test i used: http://pcflank.com/scanner1s.htm
Found the problem. It was the router. When I connected directly to modem and ran the test all incl. TCP FIN was stealth. So I changed my router with a backup tht I had and ran the test again and now still all are stealth incl. TCP FIN.