TLS1.1以降のみ有効なサーバーのHTTPS接続に失敗する問題を修正

[opentween/open-tween.git] / OpenTween / Connection / Networking.cs

diff --git a/OpenTween/Connection/Networking.cs b/OpenTween/Connection/Networking.cs
index 830bf42..86e7142 100644 (file)
--- a/OpenTween/Connection/Networking.cs
+++ b/OpenTween/Connection/Networking.cs
@@ -106,6 +106,10 @@ namespace OpenTween.Connection
             Networking.initialized = true;
 
             ServicePointManager.Expect100Continue = false;
+
+            // 明示的に指定しないと、デフォルトでは SSL3.0, TLS1.0 のみ有効となる (.NET Framework 4.5.1)
+            // https://blogs.technet.microsoft.com/jpieblog/2015/04/07/net-framework-tls1-1-1-2/
+            ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
         }
 
         public static void SetWebProxy(ProxyType proxyType, string proxyAddress, int proxyPort,