Windows Server 2008 R2中SSL/TLS安全通道创建失败问题求助

云原生阿岚

2026-7-17

问题汇总

SSL/TLS安全通道创建失败问题

在Windows Server 2008 R2环境中执行指定C#代码时，抛出错误：The request was aborted: Could not create SSL/TLS secure channel。

已在系统中启用TLS 1.1和1.2，但使用IE访问同一URL时，仍提示TLS 1.1、1.2未启用。
涉及技术：HttpWebRequest、HttpClient、WebRequest

执行的C#代码

string sURL = "https://connect.medlineplus.gov/service?mainSearchCriteria.v.cs=2.16.840.1.113883.6.88&mainSearchCriteria.v.c=897294&knowledgeResponseType=application/json";

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
WebRequest request = WebRequest.Create(sURL);
request.Credentials = CredentialCache.DefaultCredentials;

request.Method = "GET";

WebResponse response = request.GetResponse();

// Get the stream containing content returned by the server.
Stream dataStream = response.GetResponseStream();

// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);

// Read the content.
sReponseInJson = reader.ReadToEnd();
dataStream.Close();