>After reading this thread, I downloaded and installed the free version
>of Zone Alarm.
>I have had it installed for about an hour, and already have received 4
>alerts of different ip addresses that were blocked trying to access my
>computer through the internet.
>Is this normal? Would this be hackers trying to get into my system? I'm
>just wondering what's been happening up until I installed Zone Alarm/
Most of this is probably just "background radiation".
Pings and other connection attempts are the normal way internet
communication works. A client asks the server whether it is offering a
service by sending a connection request on a specific port (e.g.
http=port 80). Pings are used to check whether a machine is still alive.
If your machine doesn't have software listening on that port to provide
service (e.g. a web server) it replies that this port is closed: "this
service is not available here". No harm done with or without firewall.
If you have a dynamic ip, you might be getting old returns from the
previous owner of that ip.
If you're getting requests on ports that usually don't belong to a
standard service but a known trojan - then it's probably someone scanning
the net for computers with that trojan. However if you don't have this
trojan "installed" on your system there's still no danger - your system
simply ignores those requests. Don't be too quick to report those
"offenders" more often than not they're victims themselves or the ip is
spoofed.
If you're getting A LOT requests for a specific port/trojan it's probably
a good idea to check your HD for this trojan - again with a dynamic ip
you might have someones ip who had that trojan.
In short: don't worry too much about those alerts - if you have no trojan
on your system you'd be safe even without a firewall.
Martin