From 7d4027958c16b3a06936146ec4b6032046c8d1ee Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=80=81=E4=B9=9D?= <366193849@qq.com>
Date: Sun, 1 Dec 2024 21:06:19 +0800
Subject: [PATCH] Set the default value of SslProtocol to SslProtocols.None.
 (#2106)

* Set the default value of SslProtocol to SslProtocols.None.

* Add summary of SslProtocol.
---
 .../Options/MqttServerTlsTcpEndpointOptions.cs              | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Source/MQTTnet.Server/Options/MqttServerTlsTcpEndpointOptions.cs b/Source/MQTTnet.Server/Options/MqttServerTlsTcpEndpointOptions.cs
index 135e012d..fb8a1b02 100644
--- a/Source/MQTTnet.Server/Options/MqttServerTlsTcpEndpointOptions.cs
+++ b/Source/MQTTnet.Server/Options/MqttServerTlsTcpEndpointOptions.cs
@@ -22,7 +22,11 @@ namespace MQTTnet.Server
 
         public bool CheckCertificateRevocation { get; set; }
 
-        public SslProtocols SslProtocol { get; set; } = SslProtocols.Tls12;
+        /// <summary>
+        /// The default value is SslProtocols.None, which allows the operating system to choose the best protocol to use, and to block protocols that are not secure.
+        /// </summary>
+        /// <seealso href="https://learn.microsoft.com/en-us/dotnet/api/system.security.authentication.sslprotocols">SslProtocols</seealso>       
+        public SslProtocols SslProtocol { get; set; } = SslProtocols.None;
 
         public System.Net.Security.CipherSuitesPolicy CipherSuitesPolicy { get; set; }
     }