Two of three agents were suddenly showing as offline. Servers have not had any updates or changes to the firewall and agent services are running.
I could not deploy to these machines.
Restarted PC and browser. Then DM said "One or more of your machines appear to be running old versions of Deployment Manager Agent. Please use the "Upgrade all" button to upgrade them. Or, use the "Check health" button to refresh the version numbers."
Clicked the "Upgrade all" button and agents were finally showing to be online.
(This is frustrating as DM is often "confused" and providing the wrong information to the user. In my case, every upgrade has thrown some sort of error and/or misleading information.)
Founder and President
Information Results Corporation