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Maybe. Just because
your computer is scanned doesn't necessarily mean someone
is trying to hack into your system. Your computer was probably
one of thousands that just got scanned looking for open
ports. For example, in an effort to combat recent malicious
computer viruses and worms like Nimda and Code Red, some
Internet Service Providers routinely scan computers on
their networks in an effort to identify systems at risk
and proactively warn their customers that they are at risk.
You may receive
a log entry (24.30.218.54) from National Security. This
is a network scan from Road Runner. We do not enter any
machine or look at any personal information. The purpose
of this scan is to locate those subscribers who may be
running unsecure proxies, mail servers with open relay
enabled, other unauthorized servers, or who may have a
Trojan Horse application running.
Try to judge the severity of the alarm. In many cases,
your computer was probably scanned looking for open ports.
A firewall is doing its job if detects, prevents and reports
on possible intrusions. So, if your firewall has reported
that an incident has occurred, you should feel comfortable
that your firewall has also prevented intrusion. If you repeatedly
see attempts coming from the same IP address or computer
you should be concerned.
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