How can I check that xntpd is up and running?
The easiest command to verify that xntpd is still running is ntpq -p. This command will contact xntpd on the local host, and it will list all configured servers together with some health status. If xntpd is not running, the typical error message is ntpq: read: Connection refused. If your are logged in to a UNIX machine, you can use the ps to look for the daemon.