Packets exported but Netflow Analyzer couldn't detect?

Packets exported but Netflow Analyzer couldn't detect?

Hi,

Is there any reason why Netflow couldn't detect packets coming in although from router we can see clearly packets flow exported? Both the destination IP and port are correctly configured. The only thing is, this router worked fine before. Only after I disabled netflow on it and deleted from Netflow Analyzer, Netflow Analyzer couldn't detect the router although I have enable back netflow from the same router.

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