I am experiencing what I think is the same bug on lucid 10.04.4. About once per hour, check_ntp_time reports "Offset unknown" causing Nagios to alarm, only to fix itself a short while later. Please let me know if I can provide any more details, or if I should open this as a new bug report.
lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 10.04.4 LTS Release: 10.04 Codename: lucid uname -a Linux redacted 2.6.32-42-server #95-Ubuntu SMP Wed Jul 25 16:10:49 UTC 2012 x86_64 GNU/Linux date && /usr/lib/nagios/plugins/check_ntp_time -H local_ntp_server Tue Aug 21 11:28:54 MDT 2012 NTP CRITICAL: Offset unknown| date && /usr/lib/nagios/plugins/check_ntp_time -H local_ntp_server Tue Aug 21 11:32:35 MDT 2012 NTP OK: Offset 0.006026506424 secs|offset=0.006027s;60.000000;120.000000; dpkg -l nagios-plugins ii nagios-plugins 1.4.14-1ubuntu1 Plugins for the nagios network monitoring and management system -- 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