netflow on fortigate WAN interface

hi,

i have enabled sflow on WAN interface of Fortigate 90D firmware 5.4.3. configuration as below:

config system interface

edit "wan1"

set vdom "root"

set mode pppoe

set allowaccess https snmp fgfm

set vlanforward enable

set type physical

set sflow-sampler enable

set sample-rate 100

set polling-interval 30

set sample-direction rx

config system sflow

set collector-ip 10.1.1.139

set collector-port 9996

i can see NFA flow count number getting more and UDP 9996 can be captured by wireshark, but there is no analyze data show in NFA v12.

please help, thank you!

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