We are having the exact same problem but with Meraki switches and AP s instead of Juniper. Same issue, every week or two, these devices will show as having a node down. We cannot ping thedevices from a command prompt from the SolarWinds server, but they are pingable from every other worksation/server on the network, Within a couple of hours, each node comes back online over different time intervals. All other IPs on the network are pingable, just not these devices for a time.
Currently the SolarWinds server is also Windows 2008 R2 Hyper-V VM running under a 2012 R2 Datacenter Hypervisor..
Interesting fact, we recently migrated our SolarWinds server from a VMware VM to a Hyper-V VM. We did NOT have this problem until migrating the server to Hyper-V.
Does anyone have anymore insight or progress on finding out what this issue is?
Thanks!