I am back to Sygate.
I liked Kerio 4.2.2 a lot, same as 2.1.5.
Very user friendly interface.
The only problem I had with Kerio 4.2.2 is:
From running my computer 24/7 as I do, I lost my cable modem internet connection about once/day. It stopped logging too. No 100% CPU usage or any such things as high memory usage. Only to get my internet back I needed always to reboot when that happened.
I got no clue from logs what had happened.
My ISP DNS and DHCP server IP's are not changing, it was not that.
I ran Kerio with both the default setting and mostly only application rules. And also with Blitzen Zeus's Packet filter rules, but same thing happened.
Whether Kerio is to blame I cannot really tell, cause I also tried AntiHook program, and maybe it or something else left leftovers in my computer.
So I am back with Sygate and I will tell if I have messed up my computer with too many security programs or something and Sygate also stops working as it never has before.
If you don't see my post in this thread about this, then SPF is working to me as it always has great.
Avast sure had nothing to do with that problem with Kerio I think