The Offline or Online Simulator relies on an external process to run correctly, com_e30.exe. If this process is running before the Simulator begins, it can interfere with how the Simulator works, causing the Port 8000 error. On your PC open Windows Task Manager » Processes tab. Check if com_e30.exe exists. If it does, end it… Read More I received a “The HMI system is being prohibited from accessing local devices. Please check if the HMI port no. (8000) is occupied” error.