A bug affecting NSCA versions 2.6 and 2.7 has been fixed with a new 2.7.1 release. The bug prevented the NSCA daemon from working properly in single process mode. The new release can be downloaded here.
Nagios Update: XI 5.6.6
Nagios XI update 5.6.6 is now released! This update resolves a number of minor bugs and one security vulnerability fix. This version also includes improvements