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NCMTransfer Cannot start SolarWinds TFTP Server

Recently after upgrading to 2019.4 some of our NCM jobs fail with the above error whereas they previously worked.

I have tried to uninstall / re-install the TFTP server but still get the same error.

Below is an extract of the NCM job so that you can see the error message in full for a typical device.

2020-01-08 11:49:09,556 [STP SmartThreadPool Thread #0] INFO  SolarWinds.Orion.Pollers.Framework.PollerBase - Starting polling for IP - xx.xxx.x.x, Core node ID - 915, TransferType - Download

2020-01-08 11:49:09,556 [STP SmartThreadPool Thread #0] INFO  SolarWinds.Orion.Pollers.Framework.PollerBase - Start transfer Downlaod. Core node ID: 915

2020-01-08 11:49:09,556 [STP SmartThreadPool Thread #0] INFO  SolarWinds.NCM.Transfer.TransferSetupHelper - NCMTransfer IP:xx.xxx.x.x applying connection profile Garrettcom

2020-01-08 11:49:09,556 [STP SmartThreadPool Thread #0] ERROR SolarWinds.NCM.Transfer.IndirectTftpTransfer - NCMTransfer Cannot start SolarWinds TFTP Server

System.ArgumentNullException: Value cannot be null.

Parameter name: type

   at System.Activator.CreateInstance(Type type, Boolean nonPublic)

   at System.Activator.CreateInstance(Type type)

   at SolarWinds.NCM.Transfer.TFTPServer.InitializeTftpObject()

   at SolarWinds.NCM.Transfer.TFTPServer..ctor()

   at SolarWinds.NCM.Transfer.TransferServerFactory.CreateServer(eTransferMethod method, Boolean useThirdPartyScpServer)

   at SolarWinds.NCM.Transfer.IndirectTftpTransfer.InitTftpServer()

2020-01-08 11:49:09,556 [STP SmartThreadPool Thread #0] INFO  SolarWinds.Orion.Pollers.Framework.PollerBase - Transfer completed. Config ID 00000000-0000-0000-0000-000000000000. Type: Downlaod. Core node ID 915

2020-01-08 11:49:09,556 [STP SmartThreadPool Thread #0] INFO  SolarWinds.Orion.Pollers.Framework.PollerBase - Transfer Downlaod finished. Core node ID: 915. Took 00:00:00.0096216

2020-01-08 11:49:09,556 [STP SmartThreadPool Thread #0] INFO  SolarWinds.Orion.Pollers.Framework.PollerBase - Polling for IP - xx.xxx.x.x, Core node ID - 915 finished. Took 00:00:00.0098241

Any Ideas what the issue may be and how i resolve it?

Thanks in advance.