Portmon — Error 2

| Tool | Platform | Supports USB? | Free | |------|----------|---------------|------| | (Eltima) | Windows 10/11 (x64) | Yes | No | | Free Serial Port Monitor (HHD Software) | Windows 10/11 | Yes | Yes (limited) | | com0com + Wireshark | Windows (x64) | Yes | Yes | | socat (Linux) + Serial to network | Cross-platform | Yes | Yes | | PySerial + logging wrapper | Any Python | Yes | Yes |

mode com1: baud=9600 parity=n data=8 stop=1 Or use a PowerShell snippet: portmon error 2

This post breaks down exactly what this error means, why it happens, and the precise steps to resolve it. 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. | Tool | Platform | Supports USB