Tested with latest firmware ( https://wiki.teltonika.lt/view/RUT9xx_Firmware
) and the port forward is working. Make sure that:
- router has public IP address;
- router is reachable remotely via internet;
- port forward rule configured correctly, you need to enter external port, internal IP and internal port of the device you are trying to reach. More information: https://wiki.teltonika.lt/view/Firewall#Port_Forwarding
If configured correctly but you still cannot reach it, check if devices (which you are trying to reach) has correct gateway set. It should be routers LAN IP, for example 192.168.1.1
Furthermore try pinging device IP from router (via SSH or CLI) and see if you can reach it from router.