我正在尝试将一些数据从服务访问到我的windows service. 这是其中一个线程中的代码：
HttpWebRequest webrequest = HttpWebRequest.Create(url + "/data.json?auth_token=" + authenticationToken);
ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;
System.Net.ServicePointManager.ServerCertificateValidationCallback =
((sender, certificate, chain, sslPolicyErrors) => true);
webrequest.Method = "GET";
webrequest.ContentType = "application/jsonp";
HttpWebResponse webresponse = (HttpWebResponse) webrequest.GetResponse();
Encoding enc = System.Text.Encoding.GetEncoding("utf-8");
StreamReader loResponseStream = new StreamReader(webresponse.GetResponseStream(), enc);
result = loResponseStream.ReadToEnd();
它以前工作正常。但是几天以来，它给出了错误：
The remote server returned an error: (403) Forbidden. at System.Net.HttpWebRequest.GetResponse()
编辑：
如果我通过浏览器尝试请求，我会正确地得到响应，但不是通过 windowa 服务！