The most common reason why the NarcBox was unable to sync is because the NarcBox isn't allowed to "open" the connection to the server. When this happens, the cause can be one of a few things:
Once you are able to make a connection please make sure your NarcBox is running on the most recent firmware. Most problems that occur with the NarcBox can be solved by resetting the NarcBox and updating the firmware. To do this see Firmware Updates.