One of a pair of new hosts was causing the following Nagios alert today: CRITICAL: No response from NTP server Both of the new systems have the same configuration in theory, but based on the different results something clearly was overlooked. I tried running NTP from the Nagios host: Host 1 $ check_ntp -H ephemeralbox1.osric.net … Continue reading Nagios alert: CRITICAL: No response from NTP server