CZ said:
Yes, and often it is desirable to do so to complement shortcomings in the
other f/w.
For example, firewalls often use different technologies as follows:
ZA free is only an application gate re: outbound control (IMO the weakest
type of f/w).
That is an incorrect statement that casts doubt on all the rest, however
authoritative it may appear. ZA free does not provide the individual
control of ports that Pro does, but on its High security setting of the
Firewall blocks all incoming ports not associated with an authorised
program, and passes Steve Gibson's Stealth test