Need to debug a web service while it's running on IIS 6.0

I am a bit confused about how to find the name of the service that's currently given by IIS 6.0 on Windows Server 2008.

I tried to load w3wp.exe, aspnet_wp.exe and inetinfo.exe from the command prompt and got nothing for any of them.

I'm also unsure how to manually attach this process to Visual Studio 2008 Pro.

I've never debugged something running under IIS so it's all pretty new for me, but I really need to find why this web service is returning the following error to this telnet request:


-- request --

POST /PosWebService/MobileService.asmx HTTP/1.1
Host: 204.12.25.8
Content-Type: text/xml; charset=utf-8
Content-Length: 318
SOAPAction: "http://pizzapilot/mobileservice/Version"


<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <Version xmlns="http://pizzapilot/mobileservice/" />
  </soap:Body>
</soap:Envelope>


-- response --

HTTP/1.1 400 Bad Request
Cache-Control: private
Server: Microsoft-IIS/7.0
X-AspNet-Version: 2.0.50727
X-Powered-By: ASP.NET
Date: Wed, 07 Oct 2009 01:10:00 GMT
Content-Length: 0


I appreciate any help you can provide me in helping me to establish my debugging environment.

Thanks,
newbieweb