Problem: Nagios NRPE client stops nightly
Every night at the same time the NRPE Nagios client stops working and no entries for cron (ie in /etc/crontab) can be found at this time.
Solution
Verify your configured repositories with “apt get update” and fix mentioned errors.
Investigation
A software update policy was defined to update the server nightly at 1am. But there has been a configuration error with the software repositories.
Update started, therefore NRPE got stopped. The following “apt get” stopped with an error, so no updated got installed.
Repeated every day then.