基础连接已经关闭: 未能为 SSL/TLS 安全通道建立信任关系。_xp系统 基础连接已经关闭未能为ssl

1,先加入命名空间： using System.Net.Security; using System.Security.Authentication; using System.Security.Cryptography.X509Certificates; 2，再重载CheckValidationResult方法，返回true public bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) { // 总是接受 return true; } 3,然后在HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);前面加上如下一行代码： ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);//验证服务器证书回调自动验证