问无法建立连接，因为目标计算机主动拒绝它(Selenium)

EN

using System;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
using NUnit.Framework;
using Selenium;

namespace SeleniumTests
{
[TestFixture]
public class MyFirstVCTest
{
    private ISelenium selenium;
    private StringBuilder verificationErrors;

    [Test]
    public void TheNewTest()
    {
        selenium.Open("/");
    } 

    [SetUp]
    public void SetupTest()
    {
        selenium = new DefaultSelenium("localhost", 4444, "*chrome","http://demo.volunteercampaigns.com/");
        selenium.Start();
        verificationErrors = new StringBuilder();
    }

    [TearDown]
    public void TeardownTest()
    {
        try
        {
            selenium.Stop();
        }
        catch (Exception)
        {
            // Ignore errors if unable to close the browser
        }
        Assert.AreEqual("", verificationErrors.ToString());
    }

    [Test]
    public void TheMyFirstVCTest()
    {
        selenium.Open("/?AspxAutoDetectCookieSupport=1");
        selenium.Click("link=Login");
        selenium.WaitForPageToLoad("30000");
        selenium.Type("id=ctl00_ContentPlaceHolder1_txtEmailAddress", "elonadminss@eeeorbees.com");
        selenium.Type("id=ctl00_ContentPlaceHolder1_txtPassword", "orbs123");
        selenium.Click("id=ctl00_ContentPlaceHolder1_btnlogin");
        selenium.WaitForPageToLoad("30000");
        selenium.Click("id=ctl00_lblUserName");
        selenium.Click("id=ctl00_lnkSignOut");
        selenium.WaitForPageToLoad("30000");
    }
}
}

SeleniumTests.MyFirstVCTest m = new SeleniumTests.MyFirstVCTest();
    m.SetupTest();
    m.TheMyFirstVCTest();
    m.TeardownTest();

No connection could be made because the target machine actively refused it 127.0.0.1:4444