IP 127.0.0.1

You can't capture on the local loopback address 127.0.0.1 with a Windows packet capture driver like WinPcap. The following page from "Windows network services internals" explains why: The missing network loopback interface.

You can, however, use a raw socket sniffer like RawCap to capture localhost network traffic in Windows. Read more here: http://www.netresec.com/?page=Blog&month=2011-04&post=RawCap-sniffer-for-Windows-released