On Thu, 31 Jan 2008 20:46:34 -0800, "CZ" <CZ@no99spam.com> wrote:
[color=blue][color=green]
> > You should never have two firewalls running at the same time.[/color]
>
> Why? Have you had problems doing it?[/color]


Three reasons:

1. You achieve no extra protection,
2. you incur the extra overhead of running two firewalls,
3. and you run the risk (probably small, but not zero) of conflicts
between them.

See [url]http://www.microsoft.com/athome/security/protect/firewall.mspx[/url]
which includes the following (talking about XP, but it's the same in
Vista):

"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."

[color=blue]
> I have run two f/ws together for years w/o problems[/color]


As I said, the risk of conflicts is probably small, but it's not zero.
If you haven't had a problem, consider yourself lucky. In my view,
it's pointless to run any risk for no benefit.

--
Ken Blake, Microsoft MVP - Windows Desktop Experience
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