Currently, FreeBSD servers are configured to query a ntp server daily,
through the periodic system.
This has been noticed when db-B-001 had an offset of 2 hours.
On db-B-001:
$ cd /etc/periodic/daily $ ./480.status-ntpd NTP status: ntpq: read: Connection refused
Meanwhile, service ntpdate works correctly (but is disabled in favour of the periodic version).