How does the popular Nmap scanner identify holes in network security? In this article, we examine some Nmap analysis techniques.

The Apache web server can fight back against DoS attacks. You just need a little help from Mod_evasive.

Corporate policies prohibit the unauthorized connection of hardware to the company network, threatening dire consequences in the case of non-compliance. Fair enough, but how do you actually go about catching somebody trying to plug an illegal laptop into your Ethernet?

What does Charly’s recent two-week vacation in Holland have in common with an SSH session? Nothing at all, at first sight. And therein lies a tale.

Browsers live in continual danger of compromise by a malicious site. An intermediate proxy combined with a virus scanner can help.

While going about his normal duties, Linux Magazine author Charly Kühnast was hit with a mean attack. Charly’s separate anti-spam server, which sits in front of his mail server, saved him from the mail storm.

A structured approach to Sendmail helps to maximize your spam and virus protection.

The Postfix Policyd plugin fights spam using techniques such as greylisting, source detection, volume measurements, blacklisting, and HELO rotation detection.