Could not establish trust relationship for the SSL/TLS secure channel 問題解決方法

最近在寫一個跟第三方對接的數據同步服務，在本地都沒有問題，今天放到生產環境測試報錯：

System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.

對方用的是https，看錯誤是證書問題，查了一些資料，貌似說這個問題的比較少，因此在此總結一下，以防之後用到。

public string GetResponseData(string jsonData, string url)
{
byte[] bytes = Encoding.UTF8.GetBytes(jsonData);

//1.1 在2.0下ServicePointManager.CertificatePolicy已通過時 
//ServicePointManager.CertificatePolicy = new AcceptAllCertificatePolicy(); 

//2.0 https
ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "POST";
request.ContentLength = bytes.Length;

request.ContentType = "application/json";
Stream reqstream = request.GetRequestStream();
reqstream.Write(bytes, 0, bytes.Length);
//設置鏈接超時時間
request.Timeout = 60000;

request.Headers.Set("Pragma", "no-cache");
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
if (response.StatusCode == HttpStatusCode.OK)
{
Stream streamReceive = response.GetResponseStream();
Encoding encoding = Encoding.UTF8;

StreamReader streamReader = new StreamReader(streamReceive, encoding);
string strResult = streamReader.ReadToEnd();
streamReceive.Dispose();
streamReader.Dispose();

return strResult;
}
return "";
}

//2.0 https

public bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
{
return true;
}

 

// 1.1
//internal class AcceptAllCertificatePolicy : ICertificatePolicy
//{
//public AcceptAllCertificatePolicy()
//{
//}

//public bool CheckValidationResult(ServicePoint sPoint, System.Security.Cryptography.X509Certificates.X509Certificate cert, WebRequest wRequest, int certProb)//{//return true;//}//}