I could, of course, try to reboot the system--but that sounds like an awfully Windows-y troubleshooting step.
Jul 31 09:16:51 opnsense ntpdate[12533]: Can't find host 0.pool.ntp.org: Name does not resolve (8) Jul 31 09:16:54 opnsense ntpdate[12533]: Can't find host 2.pool.ntp.org: Name does not resolve (8) Jul 31 09:16:56 opnsense ntpdate[12533]: no servers can be used, exiting Jul 31 09:17:25 opnsense ntpdate[94626]: Can't find host 0.pool.ntp.org: Name does not resolve (8) Jul 31 13:17:54 opnsense ntpdate[94626]: step time server 192.241.146.233 offset +14409.531949 sec Jul 31 13:17:54 opnsense ntp[16779]: Successfully synced time after 2 attempts. Jul 31 13:17:54 opnsense ntp[78028]: Starting NTP Daemon. Jul 31 13:17:54 opnsense ntpd[48610]: ntpd 4.2.8p15@1.3728-o Tue Jul 28 02:25:36 UTC 2020 (1): Starting Jul 31 13:17:54 opnsense ntpd[48610]: Command line: /usr/local/sbin/ntpd -g -c /var/etc/ntpd.conf -p /var/run/ntpd.pid Jul 31 13:17:54 opnsense ntpd[48610]: ---------------------------------------------------- Jul 31 13:17:54 opnsense ntpd[48610]: ntp-4 is maintained by Network Time Foundation, Jul 31 13:17:54 opnsense ntpd[48610]: Inc. (NTF), a non-profit 501(c)(3) public-benefit Jul 31 13:17:54 opnsense ntpd[48610]: corporation. Support and training for ntp-4 are Jul 31 13:17:54 opnsense ntpd[48610]: available at https://www.nwtime.org/support Jul 31 13:17:54 opnsense ntpd[48610]: ---------------------------------------------------- Jul 31 13:17:54 opnsense ntpd[55576]: proto: precision = 0.288 usec (-22) Jul 31 13:17:54 opnsense ntpd[55576]: basedate set to 2020-07-16 Jul 31 13:17:54 opnsense ntpd[55576]: gps base set to 2020-07-19 (week 2115) Jul 31 13:17:54 opnsense ntpd[55576]: restrict: 'monitor' cannot be disabled while 'limited' is enabled Jul 31 13:17:54 opnsense ntpd[55576]: Listen and drop on 0 v6wildcard [::]:123 Jul 31 13:17:54 opnsense ntpd[55576]: Listen and drop on 1 v4wildcard 0.0.0.0:123 Jul 31 13:17:54 opnsense ntpd[55576]: Listen normally on 2 igb2 [fe80::208:a2ff:fe0a:d506%3]:123 Jul 31 13:17:54 opnsense ntpd[55576]: Listen normally on 3 igb2 192.168.1.1:123 Jul 31 13:17:54 opnsense ntpd[55576]: Listen normally on 4 lo0 [::1]:123 Jul 31 13:17:54 opnsense ntpd[55576]: Listen normally on 5 lo0 127.0.0.1:123 Jul 31 13:17:54 opnsense ntpd[55576]: Listen normally on 6 igb2_vlan107 [fe80::208:a2ff:fe0a:d506%9]:123 Jul 31 13:17:54 opnsense ntpd[55576]: Listen normally on 7 igb2_vlan107 192.168.107.1:123 Jul 31 13:17:54 opnsense ntpd[55576]: Listening on routing socket on fd #28 for interface updates Jul 31 13:18:53 opnsense ntpd[55576]: ntpd exiting on signal 15 (Terminated) Jul 31 13:18:53 opnsense ntpd[55576]: 162.159.200.1 local addr 192.168.1.1 -> <null> Jul 31 13:18:53 opnsense ntpd[55576]: 23.131.160.7 local addr 192.168.1.1 -> <null> Jul 31 13:18:53 opnsense ntpd[55576]: 2600:3c01::f03c:92ff:fe12:add4 local addr fe80::208:a2ff:fe0a:d506%3 -> <null> Jul 31 13:18:53 opnsense ntpd[55576]: 90.187.99.165 local addr 192.168.1.1 -> <null>
How about new chrony plugin (devel)?