Public bug reported: Sometimes the output from check_ntp_time is "Offset unknown" while the ntp server is fine. It can stay like that for a while and then comes back to normal.
Here's a sample output while the problem was present on the server: root@server:~# /usr/lib/nagios/plugins/check_ntp_time -H 0.ca.pool.ntp.org NTP CRITICAL: Offset unknown| root@server:~# ntpdate -q 0.ca.pool.ntp.org server 24.37.24.30, stratum 3, offset -0.006237, delay 0.16121 server 72.38.129.202, stratum 2, offset 0.022085, delay 0.05280 server 208.80.96.96, stratum 3, offset 0.030917, delay 0.05905 ** Affects: nagios-plugins (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to nagios-plugins in Ubuntu. https://bugs.launchpad.net/bugs/1010110 Title: check_ntp_time sometimes report Offset unknown To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nagios-plugins/+bug/1010110/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs