webservice部署在IIS上后，就无法调用。解决办法

webservice部署在IIS上后，就无法调用。急！！
webservice部署在IIS上后，就无法调用。在本地测试过都是没有问题的。

webservice：

C# code

[WebMethod]        public string Test(string a)        {            return a;        }

C# code

string url = "http://192.168.138.157/Service1.asmx/Test";HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);        request.Method = "Post";        request.ContentType = "application/x-www-form-urlencoded";        //byte[] data = Encoding.UTF8.GetBytes("orderid=123456&unionid=0&areaid=5008&userid=1225782045&gold=100&amount=10&timeid=10000001&sign=96c0a37a51f7108388d3e7ccfcfbd49de1c11af0");        byte[] data = Encoding.UTF8.GetBytes("a=dddfg");        request.GetRequestStream().Write(data, 0, data.Length);        StreamReader sr = new StreamReader(request.GetResponse().GetResponseStream());        string ret = sr.ReadToEnd();