nProbe in IPS mode not blocking / enforcing policies

[rxrotorboy]

I have nProbe pro and ntopng pro running in IPS mode. Initially, nProbe was enforcing the L7 policies I had created, but now is not. ntopng can see the flows (using ZMQ interface), but ignores the enforcement (traffic is allowed through).
My setup is as follows:
Debian 11
1 x LAN and 1 x WAN interface (not bridged)
iptables forwarding all traffic to NFQUEUE: iptables -A FORWARD -j NFQUEUE --queue-num 0 --queue-bypass
zmq on tcp 1234
zmq publish events on tcp 5557

[cardigliano]

@rxrotorboy a few questions:

1. you specified "not bridged", does this mean you are not setting up a bridge with the LAN and WAN interfaces? Are you using the box as a router (ip forwarding)?
2. what did you do to break the old working configuration? Did you update the software? From which to which version? Did you also change something in the configuration?
   Thank you