Wolfgang Barth has written an excellent book on Nagios titled “Nagios: System and Network Monitoring”, which I would certainly recommend to both new and seasoned Nagios users. No Starch Press is offering Nagios users a discount when ordering the book – click here for more information.
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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