Hello,
By default RUT firewall blocks access to ports 22/80/443 when trying to access it from zone different than LAN.
Have you enabled remote access via System -> Administration -> Access control?
If you have activated this option, remember to indicate the port you wish to access. In the case of access via WebUI, you must enter the ip and then the selected port in the web browser. Remember that web browsers have port 80 configured by default.
Here is an example if you modify the port to number 85.