Hi Braun,
The WSDL links which you have mention is working perfectly , check whether are you are able to view the WSDL in IE . If you are able to view the WSDL content using IE then SOAP UI will definitely upload the file .
I think you need to specify some details in the Proxy settings under PREFERENCES . .
I.e Go to File ->Preferences -> Proxy settings
Under that mention the HOST name and Port details
Kindly let me know whether my solution solves your issue or not
Thanks
With Regards
Anand Kiran