Arggh! Nothing like admins making changes that break things right before a 3-day holiday weekend and not telling anyone. The Nagios.org site was moved (unknown to me) Saturday morning and left in a broken state. I moved the site to a new provider, so DNS changes should finish propagating by this afternoon.
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