SoapUI is not working even with the sample WSDLs

Hi,

I am new to SoapUI.
When we try to import calculator WSDL , It was throwing the error"Error loading ...http://www.dneonline.com/calculator.asmx?wsdl Failed to load URL":

WSDL: http://www.dneonline.com/calculator.asmx?wsdl

The proxy settings given: Automatic setting in browser, Disabled proxy setting in SoapUI
Able to access the same WSDL in the web browser(IE) with automatic settings. So disabled the proxy setting in SoapUI.

Please help to resolve this issue.

Thanks,
Anju