Error loading WSDL

I am getting the following error: when trying to load a WSDL to  a project.

Error loading [https://collapi.bartec-systems.com/CollAuth/Authenticate.asmx?wsdl]: org.apache.xmlbeans.XmlException: org.apache.xmlbeans.XmlException: error: Unexpected character encountered: 'C'

 

I can access the WSDL from a browser.

I have tried turning the proxy off and that just removes the NT login part, but still leave the error

 

any ideas welcome?

I have treid putting all the following in the vmoptions file:

-Dsoapui.https.protocols=TLSv1.2
-Djava.net.preferIPv4Stack=true
-Djsse.enableSNIExtension=false

 

many thanks in advance