"NetFlow Receiver Service [SWSAM] received an invalid v9 template with ID 257 from device x.x.x.x. See knowledge base for more information."

I am facing this issue for one week anybody has a resolution for this issue.

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Have you checked the netflow template that the device is using? NetFlow v9 Datagram Knowledge Series: Part 3 - NetFlow v9 Template FlowSet - Geek Speak - Resources - THWACK - SolarWinds Community This is an old post but it has some good information about flow and flow templates.