Help - Internal network port forwarding problem

I have new ipfire core 159 installation with RED and GREEN interfaces. GREEN network is (base network, ipfire LAN ip Green interface is connected to unmanageable switch. To this switch is also another network (backup network) connected. I can configure Ipfire (by adding second IP address to GREEN interface as gateway/DNS for backup network) so backup network has access to internet, but i need to forward internal port to dedicated IP:22714 on intenet cloud server. When i set up forwarding with ipfire GUI, ipfire logs allowed connections to but no forwarding is made and no logs about blocked packets in forward chain. Tested similar rule to forward to same internet cloud server port 22714 - works without problems.
Where is the problem?