We are having serveral application monitors which uses WMI for monitoring.
Some monitors have Unknown status now and then.
Some monitors have Unknown status almost every second polling.
Most problematic servers are located over WAN (via VPN tunnel), however response times are OK (below 6 ms).
Here's example from one Windows server.
I have used debugging option and found error message when Unknown status is active:
2014-04-23 10:12:52,362 [STP Pool:134 Thread #0] [C441] ERROR SolarWinds.APM.Probes.ProbeBase`1 - Unhandled exception.
System.Runtime.InteropServices.COMException (0x800706BE): The remote procedure call failed. (Exception from HRESULT: 0x800706BE)
at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
at System.Management.ManagementObjectSearcher.Get()
at SolarWinds.APM.Probes.ProcessInfo.GetProcessInfo(ManagementScopeContext scope, IEnumerable`1 pids, IList`1 processNames, IList`1 commandLineFilters)
at SolarWinds.APM.Probes.ProcessProbe.ProbeInternal(ProbeInformation probeInfo, ProcessMonitorResult result)
at SolarWinds.APM.Probes.ProcessProbe.Probe(ProbeInformation probeInfo, ProbeResultBase result)
at SolarWinds.APM.Probes.ProbeBase`1.Probe(ProbeInformation probeInfo, ProbeResultBase result, ProbeHierarchyExecutionContext executionContext)
at SolarWinds.APM.Probes.ProbeBase`1.Probe(ProbeInformation probeInfo, ProbeHierarchyExecutionContext executionContext)
Any suggestions what could cause this?
We have had this problem always so this is not related to any upgrade or other change.