Hi,
Please ensure that your device has internet connectivity. Go to CLI of the device and ping 8.8.8.8.
If ping failed, that means there is no internet on the device.
Other than that, you can try adding the RMS IP 18.196.62.30 on Services->Cloud Platforms-> RMS page.
Make sure your RUT240 has the correct time zone set up on it.
Check if you have enough credits on your RMS account.
If still cannot connect, please send the troubleshoot file via Private message. Download the troubleshoot from system->Administration->Troubleshoot.
Regards,
Ramandeep