If you are receiving NetFlow v9 flows from a device without an appropriate template for longer than 15 minutes, SolarWinds NTA displays this error:
"NetFlow Receiver Service [xy] received NetFlow v9 flows without any template for decoding them. Configure the device x.x.x.x to export an appropriate NetFlow v9 template at 1-minute intervals. See help for details."
For more information about appropriate commands, see documentation of the device.