"Keeping a server or workstation updated with the latest
security patches can be a daunting task. Compounding the problem is
the number of distinct operating systems and hardware in an
organization. Nessus, an open source vulnerability scanner, can
help with this complex task.
"Nessus is available for both Windows and Unix systems, so you
can run vulnerability tests on and from distinct platforms. The
application has both a client and a server component, which allows
you to execute security assessments flexibly..."