Improve connection disposal.

Source/MQTTnet.Server/Configuration/SettingsModel.cs

@@ -45,6 +45,9 @@
         /// </summary>
         public RetainedApplicationMessagesModel RetainedApplicationMessages { get; set; } = new RetainedApplicationMessagesModel();
 
+        /// <summary>
+        /// Enables or disables the MQTTnet internal logging.
+        /// </summary>
         public bool EnableDebugLogging { get; set; } = false;
     }
 }

Source/MQTTnet.Server/Configuration/TcpEndpointModel.cs

@@ -60,13 +60,13 @@ namespace MQTTnet.Server.Configuration
         {
             if (IPv4 == "*")
             {
-                address = IPAddress.Parse("0.0.0.0");
+                address = IPAddress.Any;
                 return true;
             }
 
             if (IPv4 == "localhost")
             {
-                address = IPAddress.Parse("127.0.0.1");
+                address = IPAddress.Loopback;
                 return true;
             }
 
@@ -81,10 +81,8 @@ namespace MQTTnet.Server.Configuration
                 address = ip;
                 return true;
             }
-            else
-            {
-                throw new System.Exception($"Could not parse IPv4 address: {IPv4}");
-            }
+
+            throw new System.Exception($"Could not parse IPv4 address: {IPv4}");
         }
 
         /// <summary>
@@ -95,13 +93,13 @@ namespace MQTTnet.Server.Configuration
         {
             if (IPv6 == "*")
             {
-                address = IPAddress.Parse("::");
+                address = IPAddress.IPv6Any;
                 return true;
             }
 
             if (IPv6 == "localhost")
             {
-                address = IPAddress.Parse("::1");
+                address = IPAddress.IPv6Loopback;
                 return true;
             }
 
@@ -116,10 +114,8 @@ namespace MQTTnet.Server.Configuration
                 address = ip;
                 return true;
             }
-            else
-            {
-                throw new System.Exception($"Could not parse IPv6 address: {IPv6}");
-            }
+
+            throw new System.Exception($"Could not parse IPv6 address: {IPv6}");
         }
     }
 }

Source/MQTTnet.Server/Mqtt/MqttServerService.cs

@@ -152,6 +152,7 @@ namespace MQTTnet.Server.Mqtt
             if (_settings.TcpEndPoint.Enabled)
             {
                 options.WithDefaultEndpoint();
+
                 if (_settings.TcpEndPoint.TryReadIPv4(out var address4))
                 {
                     options.WithDefaultEndpointBoundIPAddress(address4);

Source/MQTTnet.Server/appsettings.json

@@ -18,14 +18,14 @@
         */
         "TcpEndPoint": {
             "Enabled": true,
-            "IPv4": "localhost",
-            "IPv6": "localhost",
+            "IPv4": "*",
+            "IPv6": "*",
             "Port": 1883
         },
         "EncryptedTcpEndPoint": {
             "Enabled": false,
-            "IPv4": "localhost",
-            "IPv6": "localhost",
+            "IPv4": "*",
+            "IPv6": "*",
             "Port": 8883,
             "CertificatePath": "/absolute/path/to/pfx"
         },
@@ -45,7 +45,7 @@
             "Filename": "RetainedApplicationMessages.json",
             "WriteInterval": 10 // In seconds.
         },
-        "EnableDebugLogging": false
+        "EnableDebugLogging": true
     },
     "Logging": {
         "LogLevel": {