We have been demoing out OpManager 9 for the last couple weeks and the setup looks ok. However, I frequently receive SMS messages (sometimes 30 at a time) that state:

Attention - Host name

Message: Device not responding: Probably down or busy

Device - Host name

Category - server/router/etc.

Error Condition: Attention

If I check the status of these hosts, even immediately after receiving these alerts, I can ping, SMB, RDP or SSH these devices just fine. 

On the opposite end, we did have an outage at one point of a switch and a few upstream switches, which Nagios reported instantly as being done. Unfortunately OpManager either told me 1-3 hours later and on some did not tell me at all about them being down.

Seeing as this product is widely used and respected, and given the price tag, I'm wondering what's going on? I can produce any logs upon re