我正在尝试使用“Selenium Remote Webdriver”进行自动化测试，但在尝试连接远程服务器时出现异常。
例外是：
Unexpected error. System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it 127.0.0.1:4444
at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
--- End of inner exception stack trace ---
at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context)
at System.Net.HttpWebRequest.GetRequestStream()
at OpenQA.Selenium.Remote.HttpCommandExecutor.Execute(Command commandToExecute) in c:\Projects\WebDriver\trunk\dotnet\src\WebDriver\Remote\HttpCommandExecutor.cs:line 109
at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters) in c:\Projects\WebDriver\trunk\dotnet\src\WebDriver\Remote\RemoteWebDriver.cs:line 836
我写的代码是：
DesiredCapabilities capabilities = DesiredCapabilities.Firefox();
capabilities.Platform = new Platform(PlatformType.Vista);
capabilities.SetCapability("api_key", "REPLACE_API_KEY");
capabilities.SetCapability("api_secret", "REPLACE_API_SECRET");
var remoteAddress = new Uri("http://122.176.112.91:4444/wd/hub");
// ... but only if it supports javascript
capabilities.IsJavaScriptEnabled = true;
// Get a handle to the driver. This will throw an exception
// if a matching driver cannot be located
IWebDriver driver = new RemoteWebDriver(remoteAddress, capabilities);
driver.Manage().Timeouts().ImplicitlyWait(new TimeSpan(0, 0, 30));
// Query the driver to find out more information
ICapabilities actualCapabilities = ((RemoteWebDriver)driver).Capabilities;
请帮我解决这个问题。
提前致谢。