How can I view WebService SOAP messages to check contents

I am accessing a WebService from VB.Net using a WebReference within my project.

I am getting an error, which I am told by the WebService providor is due to invalid credentials.
Therefore want to view the underlying SOAP messages to see exactly what is being sent.

I have tried the following:
Dim MyProxy As New WebProxy("http://<LocalMachineName>", 8080)
WebServiceLink.Proxy = MyProxy

And then using SoapTrace.exe acting as a proxy on localhost:8080
But I get an error message when running the code saying the "remote name could not be resolved"

Any ideas how I can fix this? or any other way to view the SOAP details?

BTW: my code for setting the credentials is:
Dim myCache As New CredentialCache
myCache.Add(New Uri(WebServiceLink.Url), "basic", New NetworkCredential(UserName, Password))
WebServiceLink.Credentials = myCache.GetCredential(New Uri(synXisWebServiceLink.Url), "basic")
WebServiceLink.PreAuthenticate = True

See anything wrong with that?
LVL 2
Gary2SevenConsultantAsked:
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Éric MoreauConnect With a Mentor Senior .Net ConsultantCommented:
have you tried fiddler (http://www.fiddlertool.com/fiddler/) ?
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Gary2SevenConsultantAuthor Commented:
Great that shows everything thanks!
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