I am using the RUTX12 router, it has the firmware version RUTX_R_00.07.02.4 installed.
My device is a Windows desktop PC, in which i have a Python script that, using the JSON-RPC protocol, connects to the router. But, for some reason when i try to send the message (IP, user and password is correct as i can enter via SSH and check it):
Please upgrade your device to the latest firmware version 7.11.12 and let me know if you continue to experience the same issue. You can download the firmware from our wiki here: RUTX12 Firmware Downloads.