Netflow on Cisco Wireless LAN Controller 2504

Netflow on Cisco Wireless LAN Controller 2504

Hi,
 
I have configure Netflow on a Cisco Wireless LAN Controller 2504 to send its flows to Netflow Analyzer. I can see the traffic but when viewing the applications, I can only see IP_App and the IP addresses (both source and destination) to be 0.0.0.0
 
Is there something more to be done?
 
Thanks
 
Thierry
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