System.ServiceModel.EndpointNotFoundException: There was no endpoint listening

I have a new WPF project in Visual Studio. I want to connect to this url: "http://www.oorsprong.org/websamples.countryinfo/CountryInfoService.wso?WSDL".

I have made a Service Reference.

When I run it, I get this error (I have translated the text to English):

System.ServiceModel.EndpointNotFoundException
  HResult=0x80131501
  Message=There was no endpoint listening at http://www.oorsprong.org/websamples.countryinfo/CountryInfoService.wso, that can accept the message. This is often because of a wrong address or SOAP-action. Find more information at InnerException.
  Source=mscorlib
  StackTrace:
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at ContactCountry.CountryConverter.CountryInfoServiceSoapType.CapitalCity(CapitalCityRequest request)
   at ContactCountry.CountryConverter.CountryInfoServiceSoapTypeClient.ContactCountry.CountryConverter.CountryInfoServiceSoapType.CapitalCity(CapitalCityRequest request) in K:\Dokumenter\Programmer\ContactCountry\ContactCountry\Connected Services\CountryConverter\Reference.cs:line 2235
   at ContactCountry.CountryConverter.CountryInfoServiceSoapTypeClient.CapitalCity(String sCountryISOCode) in K:\Dokumenter\Programmer\ContactCountry\ContactCountry\Connected Services\CountryConverter\Reference.cs:line 2242
   at ContactCountry.MainWindow..ctor() in K:\Dokumenter\Programmer\ContactCountry\ContactCountry\MainWindow.xaml.cs:line 29

Inner Exception 1:
WebException: The underlying connection was closed: Cannot connect to remote server.

Inner Exception 2:
SocketException: There was given an illegal argument

The url works fine with Widzler in Google Chrome.

Code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace ContactCountry
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            CountryConverter.CountryInfoServiceSoapTypeClient client = new CountryConverter.CountryInfoServiceSoapTypeClient("CountryInfoServiceSoap");

            myTextBox.Text = client.CapitalCity("US");
        }
    }
}

app.config:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
    </startup>

  <system.net>
    <defaultProxy enabled="false" useDefaultCredentials="false">
    </defaultProxy>
  </system.net>

  <system.serviceModel>
        <bindings>
            <basicHttpBinding>
                <binding name="CountryInfoServiceSoapBinding" />
            </basicHttpBinding>
            <customBinding>
                <binding name="CountryInfoServiceSoapBinding12">
                    <textMessageEncoding messageVersion="Soap12" />
                    <httpTransport />
                </binding>
            </customBinding>
        </bindings>
        <client>
            <endpoint address="http://www.oorsprong.org/websamples.countryinfo/CountryInfoService.wso"
                binding="basicHttpBinding" bindingConfiguration="CountryInfoServiceSoapBinding"
                contract="CountryConverter.CountryInfoServiceSoapType" name="CountryInfoServiceSoap" />
            <endpoint address="http://www.oorsprong.org/websamples.countryinfo/CountryInfoService.wso"
                binding="customBinding" bindingConfiguration="CountryInfoServiceSoapBinding12"
                contract="CountryConverter.CountryInfoServiceSoapType" name="CountryInfoServiceSoap12" />
        </client>
    </system.serviceModel>
</configuration>

I have found out that the problem is that my Visual Studio solution is on a network drive (that Windows knows as "K"). When I moved the solution to C drive, it works perfectly.

Thanks for your time!