Thank you for contacting us .
I want to know what IP you have ? Kindly refer to this link to confirm what IP you are having https://wiki.teltonika-networks.com/view/Private_and_Public_IP_Addresses
If you have public static IP there is no need of any configurations or port forwarding on Rut950, you can simply enable remote https access in the router WEBUI in System>Administration>Access Control.
Keep this part disabled in the port forwarding "Enable_HTTPS_WAN_PASSTHROUGH" (port 443) "
You can simply access the WEBUI from any of the device i.e windows or mobile etc.
After the above configurations you would be able to access router from any outside the network device by Static Public IP of the device and https port . (84.xx.xx.xx:443) .
Have a great day.