Why does the ntpd service does not start after reboot even it is enabled?

Issue

After reboot ntpd.service does not start even after enabling it with "systemctl enable".

THis is the resulting status:

systemctl status ntpd.service
ntpd.service - Network Time Service
Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled)

Active: inactive (dead)

systemctl --failed
UNIT LOAD ACTIVE SUB DESCRIPTION
fprintd.service loaded failed failed Fingerprint Authentication Daemon
rhnsd.service loaded failed failed LSB: Starts the Spacewalk Daemon
rngd.service loaded failed failed Hardware RNG Entropy Gatherer Daemon

LOAD = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB = The low-level unit activation state, values depend on unit type.

3 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.