I think that tcpmon can act as a proxy for you, sitting between the client and the server, and dumping out all the traffic in either direction. I haven't used it myself, but the docs make it look pretty simple to get set up:
<http://cvs.apache.org/viewcvs.cgi/~checkout~/xml-axis/java/docs/user-guide
.html#tcpmon>
-Roy
>In this case the server is on another machine which I
>don't have access to. I need something I can do in a
>client.
>
> Mark
