1.To find out the PID of the main process:

ps -ef | grep ccu

2. Run the command

ccu manage --conf /etc/ccu/ccu.conf --pid <PID of the main process> --set-log-level diagnostic

3. Wait 20 minutes
4. Run the command

ccu manage --conf /etc/ccu/ccu.conf --pid <PID of the main process> --set-log-level info

Commands from 2 and 4 items change the logging level, if it is set to diagnostic, then none of the above should be done, just examine the log /var/log/ccu/online.log

The /var/log/ccu/online.log file contains the informaion have been accumulated in different caches yet

Also you can examine the log /var/log/ccu/online_recv.log file - if it is empty, then nothing comes from IPFIX