Hey all, I'm running this very peculiar problem right now. I am receiving email notifications when I'm not supposed to, meaning that I have acknowledged "unknown" services that still send emails to me like it would if I had not acknowledged it already. Additionally, I have an agent installed on one of my Windows machines that says that it is not connected, even though on the web interface, it shows it's connected. See pictures below. Windows Agent showing not connected via email notification Sending notification for unknown port that I have already acknowledged Icinga2 Web Interface proving that I acknowledged this already a month ago and that the "last notification" was sent on that date (even though I just started receiving them again) Icinga2 web interface proving that the Windows agent is connected (yet, the email notification says otherwise) I've checked /var/log/icinga2/icinga2.log but didn't find anything of use. Where else should I check? It seems as if this problem started about 3/8/17 (today is 3/13/17). All I've done since then was install NagVis. Also, it seems to be that these emails send at 30 minute intervals (at xx:15 and xx:45) consistently. I have tried removing the acknowledgement and readding it, to no avail. Does anybody know what the problem could be?