MAX can't connect to CompactRIO on remote subnet using NAT

Hello. This is our problem:
We have one CompactRIO (NI 9024) and our server PC on different subnets. Between them there is a firewall, which has FTP and 44516 ports open. The firewall performs NAT, so the server doesn't see the "real" IP of the cRIO.
The problem is that when I add the cRIO to MAX ("remote subnet") using the NAT IP, it can detect it, but after some packets it tries to communicate with the real IP of the cRIO, which is not visible from the server and communication hangs.
I attached a Wireshark log. Server IP is ".230", NAT cRIO IP is ".162" and real cRIO IP is ".122".
We are using MAX 4.6.2 and NI-RIO 3.4 on the server.
Has anyone had this NAT problem before? Any idea about how to solve it?
Kind regards,
Daniel
Attachments:
44516_open_filtrado.pcap ‏5 KB

Impossible to say without seeing complete topology and configurations.

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