I am using a Cisco ASA 5510 and PRTG to monitor it. It works well with sensors configured using SNMP (SNMP Cisco ASA VPN users etc...) but I have configured ASA to export Netflow and it looks like something is wrong.
ASA only support Netflow V9 so, I used this sensor template. I tried wireshark and I can see the UDP packets on the target machine, then I tried Netflow tester (https://www.paessler.com/tools/netflowtester) and seems data has been arrived to the application layer as well.
The only difference was that the configuraion example below suggest to set Active Timout to zero but I couldn't manage it, so I have used one (1). It should not be a problem as far as I know ASA does not support this feature, but it just makes disfiguring on the graphs. https://kb.paessler.com/en/topic/1423-how-to-monitor-cisco-asa-firewalls-using-netflow-9-and-prtg
This device working as a VPN GW so 99% of the connections going through an L2L VPN. The ASA encrypt/decrypt these connections so I can see them in the connection list but not a single data in the PRTG.
Does anybody has any idea what is the problem?
OS.: Windows 2012 server PRTG ver. 18.104.22.16802 Template: Netflow V9 ASA ver. 9.1.(4)