New soapUI Project - Stream closed

Hi,

i'm new to soapUI :-(
I want to create a new soapUI project and get the error: 'Error loading [https://meldeclient.feratel.at/meldeclient/MCIoutxmllp?WSDL]: java.io.IOException: Stream closed'. Can somebody give me a hint what's going wrong? Via Firefox i can get the WSDL.
For example with the WSDL http://www.webservicex.com/globalweather.asmx?WSDL i can create a new soapUI project.
Version of soapUI: 4.0.1

Many thanks in advance.
Regards,
Martin