diff --git a/Source/MQTTnet/Adapter/MqttConnectingFailedException.cs b/Source/MQTTnet/Adapter/MqttConnectingFailedException.cs
index 44d50ec..ab49d93 100644
--- a/Source/MQTTnet/Adapter/MqttConnectingFailedException.cs
+++ b/Source/MQTTnet/Adapter/MqttConnectingFailedException.cs
@@ -5,12 +5,13 @@ namespace MQTTnet.Adapter
 {
     public class MqttConnectingFailedException : MqttCommunicationException
     {
-        public MqttConnectingFailedException(MqttClientConnectResultCode resultCode)
-            : base($"Connecting with MQTT server failed ({resultCode.ToString()}).")
+        public MqttConnectingFailedException(MqttClientAuthenticateResult result)
+            : base($"Connecting with MQTT server failed ({result.ResultCode.ToString()}).")
         {
-            ResultCode = resultCode;
+            Result = result;
         }
 
-        public MqttClientConnectResultCode ResultCode { get; }
+        public MqttClientAuthenticateResult Result { get; }
+        public MqttClientConnectResultCode ResultCode => Result.ResultCode;
     }
 }
diff --git a/Source/MQTTnet/Client/MqttClient.cs b/Source/MQTTnet/Client/MqttClient.cs
index c9ef061..4d8269d 100644
--- a/Source/MQTTnet/Client/MqttClient.cs
+++ b/Source/MQTTnet/Client/MqttClient.cs
@@ -255,7 +255,7 @@ namespace MQTTnet.Client
 
             if (result.ResultCode != MqttClientConnectResultCode.Success)
             {
-                throw new MqttConnectingFailedException(result.ResultCode);
+                throw new MqttConnectingFailedException(result);
             }
 
             _logger.Verbose("Authenticated MQTT connection with server established.");
diff --git a/Source/MQTTnet/Formatter/V5/MqttV500DataConverter.cs b/Source/MQTTnet/Formatter/V5/MqttV500DataConverter.cs
index 42d3241..886b937 100644
--- a/Source/MQTTnet/Formatter/V5/MqttV500DataConverter.cs
+++ b/Source/MQTTnet/Formatter/V5/MqttV500DataConverter.cs
@@ -139,7 +139,7 @@ namespace MQTTnet.Formatter.V5
                 ReasonCode = connectionValidatorContext.ReasonCode,
                 Properties = new MqttConnAckPacketProperties
                 {
-                    UserProperties = connectionValidatorContext.UserProperties,
+                    UserProperties = connectionValidatorContext.ResponseUserProperties,
                     AuthenticationMethod = connectionValidatorContext.AuthenticationMethod,
                     AuthenticationData = connectionValidatorContext.ResponseAuthenticationData,
                     AssignedClientIdentifier = connectionValidatorContext.AssignedClientIdentifier,