Security Concerns
While the inetd concept as a service dispatcher is not inherently insecure, the long list of services that inetd traditionally provided gave computer security experts pause. The possibility of a service having an exploitable flaw, or the service just being abused, had to be considered. Unnecessary services were disabled and "off by default" became the mantra. It is not uncommon to find an /etc/inetd.conf with almost all the services commented out in a modern Unix distribution.
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