1. Remote network security auditor, the server The Nessus Security Scanner is a security auditing tool. It makes possible to test security modules in an attempt to find vulnerable spots that should be fixed. It is made up of two parts: a server, and a client. The server/daemon, nessusd, is in charge of the attacks, whereas the client, nessus, provides the user a nice X11/GTK+ interface. This package contains the nessusd server, which must be run as root. From Debian 3.0r0 APT