My history: years and years ago, like maybe even more than 10, this old guy paid for Zone Alarm. Then for another number of years I used Comodo. By then I was starting to get a better feel for all of this PC stuff. Then a few years ago, OA free and then they offered a free license for their paid version which I used for a while. Never felt like it did a very good job of remembering "Allowed" items. Also tried PCTools for a while. Recently I've been using PrivateFirewall, which has brought me back to Comodo, since Zemana flunks its own keylogging test with PF installed. I never really ever had any issues with CFW other than when I used D+ with it, it could get annoying. I've just installed the base firewall and have enabled default "medium" settings and stealth ports. Should I enable "Protect the ARP Cache"? I am behind a router by the way! Thank you!