How To Use Portmon May 2026

If you have ever found yourself scratching your head wondering, "Is my software sending the wrong data, or is the peripheral just ignoring me?" — you need PortMon .

PortMon (Port Monitor) is a classic, lightweight utility from Microsoft’s Sysinternals suite (written by Mark Russinovich). Although it is legacy software (last updated for Windows XP/7), it remains an indispensable tool for debugging serial (RS-232) and parallel port communication on older systems or within virtual machines. how to use portmon

“Serial debugging without a monitor is like lip-reading through a brick wall.” Fire up PortMon, watch the bytes flow, and fix that ancient hardware. Have a PortMon war story? Drop it in the comments below! If you have ever found yourself scratching your