If you need to use HTTP/HTTPS protocol to access NVR via web browser, or you need to add the NVR to 3rd-party software, follow this guide to set up the ports of your device on NVR (New UI).
Applies to: RLN8-410 (hardware version H3MB18/N2MB02/N3MB01/N7MB01), RLN16-410 (hardware version H3MB18/N6MB01), RLN36 and RLN12W.
Launch NVR, go to Settings > Network > Advanced, then click Server Settings.
The value of all ports will show up. And you can set up the ports as you want.
Note: The range of the port number is 1~65535.
Regarding the function of different ports, you can refer to this article: Which Ports Should I Forward on Router for Remote Connection