I had the same issue,
In my case i was addressing the WSDL for the port but you need to address the binding.
I've created the port manually filling the username and password in the 'Consumer Security' subscreen'
And in the 'Transport Settings'
URL Acess Path - I've put the URL of the binding
Computer - IP of the system
Port - Port
Protocol - HTTP
And it worked for me
Best regards,
Vagner Rizzo