Solution:
I've created a new default cupsd.conf file. That strange behavior no
longer exists.
Until 2 weeks ago there had been needed only that Listen entry:
Listen /var/run/cups/cups.sock
Now to work correctly 2 lines are needed:
Listen localhost:631
Listen /var/run/cups/cups.sock
Bug can be
I have forgetten to mention a detail.
The locally connected printers via parallel interface are working after
system start with systemd. The printers connected via ethernet don't.
All printers are working after system start with sysvinit.
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