diff --git a/websocket-sharp/Net/ClientSslConfiguration.cs b/websocket-sharp/Net/ClientSslConfiguration.cs
index 800bcb30..0cae24a6 100644
--- a/websocket-sharp/Net/ClientSslConfiguration.cs
+++ b/websocket-sharp/Net/ClientSslConfiguration.cs
@@ -64,7 +64,7 @@ namespace WebSocketSharp.Net
     /// </summary>
     public ClientSslConfiguration ()
     {
-      _enabledSslProtocols = SslProtocols.Default;
+      _enabledSslProtocols = SslProtocols.None;
     }
 
     /// <summary>
@@ -77,7 +77,7 @@ namespace WebSocketSharp.Net
     public ClientSslConfiguration (string targetHost)
     {
       _targetHost = targetHost;
-      _enabledSslProtocols = SslProtocols.Default;
+      _enabledSslProtocols = SslProtocols.None;
     }
 
     /// <summary>
@@ -195,7 +195,7 @@ namespace WebSocketSharp.Net
     ///   the protocols used for authentication.
     ///   </para>
     ///   <para>
-    ///   The default value is <see cref="SslProtocols.Default"/>.
+    ///   The default value is <see cref="SslProtocols.None"/>.
     ///   </para>
     /// </value>
     public SslProtocols EnabledSslProtocols {