the rpm for xntpd does not contain any symlinks in /etc/rc.d/rc[0123456].d/ pointing to the script in .../init.d/ This prevents ntp from being started at boot time. Manual intervention necessary.
Run /sbin/chkconfig xntpd --add to initially create the links. Then run /usr/sbin/ntsysv and select the xntpd service to be started up. You will then have a link /etc/rc.d/rc3.d/S55xntpd The symlinks cannot be created by default because xntp needs a working ntp.conf.
*** Bug 9551 has been marked as a duplicate of this bug. ***