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Home > Success Center > Netflow Traffic Analyzer (NTA) > The Netflow Service will not start on an Additional Polling Engine

The Netflow Service will not start on an Additional Polling Engine

Updated: October 2, 2017


The Netflow Service will not start on an Additional Polling Engine. When this issue occurs, the following error displays in the NTA.BusinessLayer.log file:

XXXX-XX-XX XX:XX:XX,XXX [6] ERROR SolarWinds.Orion.NetFlow.Service.NetFlowService - Error while starting service.
System.TypeInitializationException: The type initializer for 'SolarWinds.Netflow.Processing.AppContext' threw an exception. ---> System.TypeLoadException: Could not load type 'SolarWinds.Orion.Common.SWPerfMonSession' from assembly 'SolarWinds.Orion.Common, Version=, Culture=neutral, PublicKeyToken=316e86daa515e407'.
at SolarWinds.Netflow.Common.Performance_Counters.NetflowPerformanceCounters..ctor()

at SolarWinds.Netflow.Common.Performance_Counters.NetflowPerformanceCounters.<.cctor>b__4()

at System.Lazy`1.CreateValue()
at System.Lazy`1.LazyInitValue()
at SolarWinds.Netflow.Processing.ReceiverApp..ctor()
at SolarWinds.Netflow.Processing.AppContext..cctor()
--- End of inner exception stack trace ---
at SolarWinds.Netflow.Processing.AppContext.Initialize()
at SolarWinds.Orion.NetFlow.Service.NetFlowService.OnStart(String[] args)


  • All Orion NTA environments


NTA is unable to create the needed performance counters to start the service.


Rebuild the performance counters and restart the service. 

See Performance counters are not working or missing in PerfMon for details.




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