希望有人可以帮助解决这个问题.最近我们的机器更新了KB4344167,其中包括.NET 4.7.1的安全更新. 不幸的是,这个更新破坏了我们的代码Webrequest.当我们运行下面的代码时,我们收到此错误:
请求已中止:无法创建SSL/TLS安全通道.
// Create a request for the URL.
WebRequest request = WebRequest.Create(url);
//specify to use TLS 1.2 as default connection
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
request.Timeout = int.Parse(configmanager.GetSetting("Webtimeout"));
// Set proxy
request.Proxy = WebRequest.DefaultWebProxy;
request.Proxy.Credentials = CredentialCache.DefaultCredentials;
// Define a cache policy for this request only.
HttpRequestCachePolicy noCachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore);
request.CachePolicy = noCachePolicy;
ServicePointManager.ServerCertificateValidationCallback = (s, cert, chain, ssl) => true;
// Get the response.
HttpWebResponse response …