Internet intruders have many ingenious ways of escalating privileges and hiding their presence once they get inside your system. The best protection is to keep them out in the cold.

Reviews of O'Reilly's Beautiful Code: Leading Programmers Explain How They Think, Prentice Hall's The Official Damn Small Linux Book, and Linux Firewalls: Attack Detection and Response with iptables, psad, and fwsnort from No Starch Press.

Spanish security researchers have discovered several vulnerabilities in the "Firewall-1" security solution by software vendor Checkpoint, and are now questioning its Common Criteria EAL4+ certification.

Development of the new version of the Gibraltar security software took more than a year. The release of Gibraltar 2.5 sees enhanced functionality and simplified use.

Novell is extending its portfolio of enterprise management solutions with its acquisition of Senforce Technologies, an endpoint security management specialist.

Firewalls are becoming evermore sophisticated. Luckily, the tools for managing firewalls are becoming simpler and more accessible for ordinary users

Netfilter firewalls create highly detailed logfiles that nobody really wants to inspectmanually. Logfile analysis tools like IPtables Log Analyzer,Wallfire Wflogs,and FWlogwatch help administrators keep track of developments and filter for importantmessages.

The KDE Guarddog program promises an easy Linux firewall setup with just a few clicks. Guarddog helps inexperienced users secure computers – and even whole networks – against attack.