After reading many messages in this group about the disadvantages of personal firewalls, I have a kind of hazy understanding about what they are but one thing still puzzles me:-
What exactly are the vulnerabilities created by installing personal firewalls? The short answer seems to be:-
a) They don't stop outgoing traffic except from applications which allow themselves to be controlled.
To me this doesn't seem so serious - as I recall one contributor commented that some control over outgoing is better than non at all.
b) They open up some services in Windows XP which most users shouldn't have running, and therefore make the computer more vulnerable to malware.
This seems quite serious, but I can't recall anyone listing what those services are and I think to myself, "if these personal firewalls have been studied in a technical sense and found to open undesirable services, surely there would be a list of what they are, for each of the personal firewalls such as Kerio, Outpost, Sygate and Zone Alarm".
I'm just being curious, but has anyone a reference I could look up which lists what these services are, for each of the above firewalls?
(Or are people just making assumptions that personal firewalls can't operate without opening undesirable services)?