Can Online Port Scans Be Trusted?
Posted: Thu Oct 07, 2004 8:42 am
I've been running a firewall (Norton 2002/2003 and Free Kerio 2.5) for the past 3 years and never had any problems with port scans. Suddenly, about 3 months ago, I began to get reports of "closed only" ports, Later, still using the same Sygate Online Scans, I even showed "open" ports.
Now I use 4 or 5 different scanners and get pretty much 4 or 5 different sets of scan data.. some of them showing totally opposite results.
This also applies to the Free Kerio 5.1, Free ZoneAlarm, and Free Sygate firewalls, all of which have been tried out in the last 3 weeks.
I scan often with regularly updated AV and pest scanners.
I know these firewalls are plenty capable of stealthing the ports on my computer, so what can it be? Could there be something on my system that is designed to screw up any firewall that might be installed?
Now I use 4 or 5 different scanners and get pretty much 4 or 5 different sets of scan data.. some of them showing totally opposite results.
This also applies to the Free Kerio 5.1, Free ZoneAlarm, and Free Sygate firewalls, all of which have been tried out in the last 3 weeks.
I scan often with regularly updated AV and pest scanners.
I know these firewalls are plenty capable of stealthing the ports on my computer, so what can it be? Could there be something on my system that is designed to screw up any firewall that might be installed?