This program will render your computer invisible to hackers’ probes. Hackers run scanning programs over the Internet, looking for computers with electronic openings, called ports. A good firewall such as this one makes your computer invisible to the scanners.
The goal of these intruders is to place a Trojan horse on your computer. The rogue program uses the open port previously identified by a scanner.
ZoneAlarm blocks those transmissions. They can only go through if you agree. Always say no, unless you recognize the program.