SoapUI "failed to load url" error when loading WSDL

In my case the server were the service was installed was configured only for TLS. SSL was not allowed. So you have to update SoapUI vmoptions file by adding

-Dsoapui.https.protocols=TLSv1.2

You can find vmoptions file under SoapUI installation folder:

C:\Program Files (x86)\SmartBear\SoapUI-5.0.0\bin\soapUI-5.0.0.vmoptions

OR change your server setting to allow SSL

I have had the same problem. I resolved it by disabling the proxy in the SoapUI preferences. (source : http://www.eviware.com/forum/viewtopic.php?f=13&t=12460)

I have had similar problems and worked around them by saving the WSDL locally. Don't forget to save any XSD files as well. You may need to edit the WSDL to specify an appropriate location for XSDs.