I recently had an issue with an external script within Nagios which used the check_npre command to run a number of performance tests from Apache JMeter. On running the scheduled check for the first time, this would fail with the following: CHECK_NRPE: Socket timeout after 30 seconds. The initial service check exceeded the configured NRPE … More Nagios XI: CHECK_NRPE: Socket timeout after 30 seconds.