NSCA 2.9.1 has just been released and now supports backwards compatibility with older agents using smaller packet sizes. You can download the tarball from SourceForge at http://sourceforge.net/projects/nagios/files/nsca-2.x/nsca-2.9.1/. The Changelog can be found here. Thanks to Eric Stanley and Daniel Wittenberg for their work on this release!
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