iperf not working

[fgerardi]

I searched the forum and could not find anything useful about this subject...iperf does not work on my opnsense.
I go to Interfaces/Diagnostic/iperf and create a new instance on lan interface. After few seconds a result summary appears where the port is declared. Then, I run my iperf client pointing to the firewall ip and port of iperf instance...this connection fails by timeout.
I took a packet capture from opnsense and I can see the client trying to connect but the firewall does not respond.
I also ckecked the firewall log and I can confirm no rules are blocking this communication.

Any ideas?

Thanks,
Fabrizio