We have had a few nodes there were down, but Solarwinds kept thinking they were up. We are monitoring them via ICMP, tried pinging from the poller and was getting no response, but solarwinds still showed green. The only thing that has fixed it for us is deleting the node and adding it again.
My big question is how to I find out why Solarwinds is not reporting when a node goes down? I can't send my diag file to SW due to Nerc-cip data so I am stuck looking at all the logs myself.