Monitoring SOAP requests

The easiest way is to use TCP-Monitor (either the Eclipse plugin or the standalone application https://tcpmon.dev.java.net/ );

this entails pointing your test suite to a different port, and with WLI test client (Web) this doesn't work because they hardcode the portnumber in the HTTP Response (smart!).

Perhaps using this trick http://tompson.wordpress.com/2006/12/20/tcp-monitor-plugin-for-eclipse/ of pointing the JVM to use the TCP mon as a proxy (-Dhttp.proxyHost=localhost -Dhttp.proxyPort=8080) you can make it work...

I have tried this PortPeeker port traffic monitoring tool:
http://www.gold-software.com/PortPeeker-file2605.html
but it cannot examine an already opened port.... pretty useless for a sniffer tool...

Let's try then Wireshark http://www.wireshark.org/
or tcpdump / windump http://www.mirrorservice.org/sites/ftp.wiretapped.net/pub/security/packet-capture/winpcap/windump/
(both Wireshark and WinDumo use WinpCap libraries to capture traffic)