Why not? Btw, it is Kerio 2.15, if you have one that does just certain
things and the other that does not conflict, in this instance, by
handling incoming pings?
That's not the way firewalls work. A firewall manages your connection(s)
by taking control over what can get in and out. Putting another alongside
it does not mean that it will catch things the first firewall doesn't.
Typically, the OS will assign one of the firewalls to manage the
connection, and the other will just be spare baggage. Plus, there is a
potential for conflicts between the programs. I remember it being said
that Kerio and Zone Alarm definitely do not like one another.
Your problem with Kerio can likely be solved by writing a rule to deal
with it. I always disallow ICMP and UDP, both ways, and never had a
problem. If for some reason that causes a problem, a specific allow rule
can be written for that specific application. Disallowing those across
the board should cure the ping problem.
I was a devoted 2.1.5 fan, but now that I have gotten used to Sygate,
would never go back. Sygate allows you to write very specific rules, but
is much more user friendly than Kerio 2.1.5. Also, it is still alive, and
there is the unfragmented packets vulnerability in 2.1.5 that will never
be fixed.