title: How to sniff a USB port under Windows?
body: <p>From time to time, I need to dump USB traffic under Windows, mostly to support hardware under Linux, so my primary goal is to produce dump files for protocol analysis.</p>
  
  <p>For USB traffic, it seems that <a href="https://web.archive.org/web/20151218000528/http://www.pcausa.com/Utilities/UsbSnoop/default.htm" rel="noreferrer">SniffUsb</a> is the clear winner... It works under Windows&nbsp;XP (but <em>not</em> later) and has a much nicer GUI than earlier versions. It produces <em>huge</em> dump files, but everything is there.</p>
  
  <p>However, my device is in fact a USB serial device, so I turned to <a href="http://technet.microsoft.com/en-us/sysinternals/bb896644.aspx" rel="noreferrer">Portmon</a> which can sniff serial port traffic without the USB overhead.</p>