Web服务：403禁止错误

Question

I'm trying to access some data from a service into my windows service . This is the code in one of the threads:

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();

It was working properly before. But since few days, it is giving error: The remote server returned an error: (403) Forbidden. at System.Net.HttpWebRequest.GetResponse() The remote server returned an error: (403) Forbidden. at System.Net.HttpWebRequest.GetResponse()

EDIT:

If I try the request through browser, I get the response properly, but not through windowa service!

Answer 1

It was working properly before. But since few days, it is giving error

First thing to check: has the certificate expired?