At first, the machine builder adopted Windows-based Remote Desktop Control (RDC) technology, but security risks and additional costs came at a high price. Windows-based RDC requires a Windows-operated computer to be installed at the factory so that the machine has remote connection capabilities. However, the Windows-based computer by itself is susceptible to security risks, and the possibility of attacks increases even more when the computer connects to the Internet. Needless to say, a cyberattack will result in a shutdown of factory operations. To preempt security risks, the machine builder needs to adopt complex IT-related firewall equipment, which is time-consuming and hard to manage. Also, each computer running RDC on the machine side requires a costly controller software license, making a remote connection very expensive in order to conduct machine maintenance or troubleshooting.