Portmon Error 2 【2025】

If you are a legacy systems administrator, a reverse engineer, or a developer maintaining older Windows applications, you have likely encountered PortMon (PortMonitor). This Sysinternals tool, while retired by Microsoft, remains invaluable for debugging serial and parallel port activity on Windows XP, Vista, and older Server editions.

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. 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 | If you are a legacy systems administrator, a

If you are a legacy systems administrator, a reverse engineer, or a developer maintaining older Windows applications, you have likely encountered PortMon (PortMonitor). This Sysinternals tool, while retired by Microsoft, remains invaluable for debugging serial and parallel port activity on Windows XP, Vista, and older Server editions.

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? | 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 |

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