ceejay Wrote: 
> For example its very unlikely to protect you against outbound "bad"
> traffic if you've caught, say, a Trojan from an incoming email (which
> your router won't catch).
> Ceejay.

Yes, it's true an external firewall wont catch outbound traffic, but
there are two problems with personal firewalls.  Firstly they give you
a false sense of security - they are easily bypassed.  Secondly, it's
another internet service begging to be attacked, potentially making
your system LESS secure!

Worth reading up on them
http://en.wikipedia.org/wiki/Personal_firewall

Stuart.


-- 
stuorguk
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