I have never used Sygate myself so I don't know it's options but it sounds like it is doing it's job. I would imagine that the help file with the program would tell you more.
I use Windows XP SP2 and have Sygate (free version) operating as my firewall.
I frequently get the Sygate tray icon 'flashing silver centre' indicating, according to Sygate's Message Console, that either "someone is scanning your computer" or some kind of "Hijacking" is going on.
How do people react to such messages, since they would appear to indicate some kind of violation which may or may not be dangerous?
Any enlightenment/advice greatly appreciated as I am on a learning curve in this area, since letting NAV go.