访问webservice出错


System.Web.Services.Protocols.SoapException: 服务器无法处理请求。 ---> System.Net.WebException: 无法解析此远程名称: 'www.cma.gov.cn'
  在 System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request)
  在 System.Net.WebClient.DownloadData(Uri address)
  在 System.Net.WebClient.DownloadData(String address)
  在 getHttpText.getHttpText(String theUrl)
  在 Service.getWeatherbyCityName(String theCityName, theDayFlagEnum theDayFlag)
  --- 内部异常堆栈跟踪的结尾 --- 
说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。 异常详细信息: System.Web.Services.Protocols.SoapException: System.Web.Services.Protocols.SoapException: 服务器无法处理请求。 ---> System.Net.WebException: 无法解析此远程名称: 'www.cma.gov.cn'
  在 System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request)
  在 System.Net.WebClient.DownloadData(Uri address)
  在 System.Net.WebClient.DownloadData(String address)
  在 getHttpText.getHttpText(String theUrl)
  在 Service.getWeatherbyCityName(String theCityName, theDayFlagEnum theDayFlag)
  --- 内部异常堆栈跟踪的结尾 ---源错误: 
行 54:         [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://tempuri.org/getWeatherbyCityName", RequestNamespace="http://tempuri.org/", ResponseNamespace="http://tempuri.org/", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)]
行 55:         public string[] getWeatherbyCityName(string theCityName, theDayFlagEnum theDayFlag) {
行 56:             object[] results = this.Invoke("getWeatherbyCityName", new object[] {
行 57:                         theCityName,
行 58:                         theDayFlag});