[ Thanks to An Anonymous Reader for
this link. ]
“Your Debian/Ubuntu Linux box security depends upon access to
system services (one of many aspects). For example, you may need to
provide a web server (Apache service) to serve web pages. However,
if you do not need use a service, you should always turn off all
unused services to avoid exploits.“Traditionally, Debian provided various tools to manage
services. There are various methods for managing access to system
services…”