From 28a72b9c292232994dc22de69e22e81dd56b6ba1 Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Tue, 17 Oct 2017 15:40:12 +0900
Subject: [PATCH] [Modify] Throw exception

---
 websocket-sharp/Server/WebSocketServer.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/websocket-sharp/Server/WebSocketServer.cs b/websocket-sharp/Server/WebSocketServer.cs
index fc7922fa..30a4aa28 100644
--- a/websocket-sharp/Server/WebSocketServer.cs
+++ b/websocket-sharp/Server/WebSocketServer.cs
@@ -591,6 +591,11 @@ namespace WebSocketSharp.Server
     /// </value>
     public ServerSslConfiguration SslConfiguration {
       get {
+        if (!_secure) {
+          var msg = "This instance does not provide secure connections.";
+          throw new InvalidOperationException (msg);
+        }
+
         if (_sslConfig == null)
           _sslConfig = new ServerSslConfiguration ();