If the device takes longer than 5 minutes to connect to the Internet, you may need to log into the local UI of the device to make configuration changes or to start the troubleshooting process. You must be physically co-located with the device in order to do this. Refer to the following document for additional help: How to Troubleshoot Connection Issues
Once the device connects to the Internet, it should then connect to your NetCloud Manager account and start its configuration download.