John
The security model of the web application with which you are trying to access the web service in question will control whether it is possible to access the service anonymously. If you are trying to access a web service through a web application that has anonymous access enabled, you can access the web service. Try this on an anonymous site (if you have one): http: //yoursitehere/_vti_bin/lists.asmx . You will return the welcome service page without requiring authorization.
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