Xinetd doesn't need to be told. Isn't there a table of standard ports for
specified services?
Yes, there's a table of standard ports -- it's /etc/services. It merely
lets you refer to ports by name rather than by number. Something still
needs to indicate what port to listen on, regardless of how its
mentioned. So, I call bull on xinetd not needing to know this.
_somehow_ it's being told.
Yes, xinetd knows because of the first line in the config file:
service nntp {
Indeed, it takes the port for nntp from /etc/services
So in systemd the ListenStream=119 is mandatory
Check
/etc/xinetd.d/leafnode
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дамјан
