The ServiceNow Dublin release includes a new enhancement around security protecting the WSDL resources on a ServiceNow instance. In the past, you had two options with regard to controlling who could view your WSDL documents. One, you could require a user to authenticate before they could see the WSDL. Two, you could allow anyone to see the WSDL document. All this was controlled by a simple checkbox in the web services security properties page.
To read more about this change and how to work with it, please see:
http://www.john-james-andersen.com/blog/service-now/unauthenticated-access-to-servicenow-wsdls.html
