I have recently upgraded our ASA to version 8.4(6) but after upgradation i have noticed that Netflow stats are not showing in our tool. I have rediscovered device in tool but still problem persist. I dont know whether issue is with config. ASA config was converted after reload from previous 8.2 version.
Below is config after upgradation OS.
access-list flow_export_acl extended permit ip host 10.110.151.11 host 10.110.151.51
flow-export destination inside 10.110.151.11 9996
flow-export template timeout-rate 1
inspect h323 h225
inspect h323 ras
flow-export event-type all destination 10.110.151.11
Cisco jumped around a bit in the different firmware releases on how the NSEL is exported. It is best explained in this post on Cisco ASA NetFlow : Bidirectional Support Added. I hope this helps, please vote on my reply if it does.