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Home > Success Center > Network Performance Monitor (NPM) > APE is in Down status after an upgrade

APE is in Down status after an upgrade

Updated June 14, 2017


The additional polling engine shows as Down even when services are up and are running after an upgrade.


NPM 12.0.1 and later


Licenses were not applied on the additional polling engine server. The following error is also found in the business layer log:

2017-06-08 14:52:07,381 [27] INFO  SolarWinds.Orion.Licensing.BusinessLayer.Tasks.RefreshLeasesFromServerCommand - Updating license leases.
2017-06-08 14:52:07,382 [27] WARN  SolarWinds.Orion.Core.Common.WCFChannelFactory`1 - System.ServiceModel.CommunicationObjectFaultedException: The communication object, System.ServiceModel.Channels.ServiceChannel, cannot be used for communication because it is in the Faulted state.

Server stack trace: 
   at System.ServiceModel.Channels.CommunicationObject.Close(TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.System.IDisposable.Dispose()

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at System.IDisposable.Dispose()
   at SolarWinds.Orion.Core.Common.WCFChannelFactory`1.DisposeChannel(T channel)


2017-06-08 14:52:07,443 [27] INFO  SolarWinds.Orion.Core.Common.WCFChannelFactory`1 - Channel LicenseServerContract to net.tcp://servername:17777/orion/licensing/licenseserver Opened
2017-06-08 14:52:07,541 [27] INFO  SolarWinds.Orion.Licensing.BusinessLayer.Tasks.RefreshLeasesLoggingPolicy - Journaling license lease refresh result [Status: Completed, Message: ''].


  1. Follow the steps in the Activate your SolarWinds NPM license article to apply the APE licenses.
  2. Restart the Orion services from the main polling engine and from the affected APE.


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