Workaround
- Open FreeNAS web interface by typing the IP or hostname into the address bar of your web browser.
- Type in your the root user name and password.
- Click on Tasks > Cron Jobs. And then click on the Add button near the top right of the screen.
- Fill in the information as follows:
- Description: NTP Update
- Command: ntpdate -u
- Run As User: root
- Schedule a Cron Job: Daily (0 0 * * *)
- Save the Cron Job.
- New Cron Job should now be listed like shown below