The Kerio Personal Firewall is a safe bet for those seeking to protect their business network. It can be set to run automatically at Windows startup, or activated manually. Three security levels are offered which can be manually configured.

At the lowest level all network activity is permitted, at the medium level it asks your permission before allowing any activity not covered by filter rules, and at the highest level it only allows activity matching defined rules.

Kerio can cover any protocol you wish it to although, apart from TCP, UDP, ICMP and ARP, all others must be entered manually.

Password protection can be applied to both administration and stats log, ensuring that your settings are not tampered with.

This latest version adds protection against rogue-diallers, can block pop-up windows and adverts, and filter cookies.