someone said:
I've heard you can't use two
firewalls.
You can, but you shouldn't, use two software firewalls. You achieve no extra
protection, you incur the extra overhead of running two firewalls, and you
run the risk (probably small, but not zero) of conflicts between them.
See
http://www.microsoft.com/athome/security/protect/firewall.mspx which
includes the following:
"Q. Should I use both the built-in firewall and a software firewall from a
different company on my Windows XP computer?
"A. No. Running multiple software firewalls is unnecessary for typical home
computers, home networking, and small-business networking scenarios. Using
two firewalls on the same connection could cause issues with connectivity to
the Internet or other unexpected behavior. One firewall, whether it is the
Windows XP Internet Connection Firewall or a different software firewall,
can provide substantial protection for your computer."
Also note that if you update your third-party firewall to a new version, the
update routine will probably turn it off first. If the Windows firewall
isn't running, you will temporarily be left with no running firewall, which
is very dangerous. So turn on the Windows firewall temporarily before doing
maintenance on your third-party firewall.
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