Portmon requires kernel-level access to monitor hardware ports. Even if you are logged into an admin account, you must explicitly right-click portmon.exe and select . This allows it to install the necessary hooks into the system. 2. Use Compatibility Mode
"Error 2 opening COM1 - The system cannot find the file specified." portmon error 2
This time, Portmon showed a cascade of healthy, black text: IOCTL_SERIAL_SET_BAUD_RATE Success IOCTL_SERIAL_SET_LINE_CONTROL Success IOCTL_SERIAL_SET_TIMEOUTS Success Portmon showed a cascade of healthy
PortMon is a kernel-mode driver tool that intercepts and logs all interactions with COM (serial) and LPT (parallel) ports. It hooks into the Windows I/O subsystem to display IRP_MJ_WRITE , IRP_MJ_READ , and IOCTL calls. and IOCTL calls.