Pkg_add -v Nessus-3.0.3-fbsd6.6.tbz: CWD to /usr/local/nessus/lib/nessu/plugins/synscan.nes: Nessus has a rules system which allows you to restrict the hosts which you can test. Nessus is a free-source network security system for the UNIXIXIX-IXIX network operating system. For example, the Nessus scanner can be downloaded from http://www.nessus.org/register/.”]
Source: https://taosecurity.blogspot.com/2006/06/nessus-3.html