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Version: Orion NTA 3.6 or higher
Assuming you have setup your device to export NetFlow to the Orion server, and you have verified with a packet capture tool that the flow packets are being sent from the device and arriving at the Orion server, the most likely cause of Orion NTA's failure to process flow packets is that the packets are not being written into the Orion database due to a firewall block.
Packet capture tools (for example, WireShark), operate on a lower level in the IP stack; so though the capture shows the packets successfully sent and received, the firewall can subsequently block their processing at the application layer, before Orion NTA can work on them.
If you are running a firewall on the Orion server, do the following: