First time ConnectTimeout error when abortonconnect is false

StackExchange.Redis.Tests/ConnectionFailedErrors.cs

@@ -87,6 +87,23 @@ public void SocketFailureError()
             }
         }
 
+        [Test]
+        public void AbortOnConnectFailFalseConnectTimeoutError()
+        {
+            string name, password;
+            GetAzureCredentials(out name, out password);
+            var options = new ConfigurationOptions();
+            options.EndPoints.Add(name + ".redis.cache.windows.net");
+            options.Ssl = true;
+            options.ConnectTimeout = 0;
+            options.Password = password;
+            using (var muxer = ConnectionMultiplexer.Connect(options))
+            {
+                var ex = Assert.Throws<RedisConnectionException>(() => muxer.GetDatabase().Ping());
+                Assert.That(ex.Message, Does.Contain("ConnectTimeout"));
+            }
+        }
+
         [Test]
         public void CheckFailureRecovered()
         {

StackExchange.Redis/StackExchange/Redis/ConnectionMultiplexer.cs

@@ -871,8 +871,12 @@ private static ConnectionMultiplexer ConnectImpl(Func<ConnectionMultiplexer> mul
                 {
                     task.ObserveErrors();
                     if (muxer.RawConfig.AbortOnConnectFail)
-                    {
-                        throw ExceptionFactory.UnableToConnect("Timeout");
+                    {
+                        throw ExceptionFactory.UnableToConnect("ConnectTimeout");
+                    }
+                    else
+                    {
+                        muxer.LastException = ExceptionFactory.UnableToConnect("ConnectTimeout");
                     }
                 }
                 if (!task.Result) throw ExceptionFactory.UnableToConnect(muxer.failureMessage);
@@ -984,6 +988,9 @@ private void OnHeartbeat()
                 return unchecked(Environment.TickCount - VolatileWrapper.Read(ref lastHeartbeatTicks)) / 1000;
             }
         }
+
+        internal Exception LastException { get; set; }
+
         internal static long LastGlobalHeartbeatSecondsAgo => unchecked(Environment.TickCount - VolatileWrapper.Read(ref lastGlobalHeartbeatTicks)) / 1000;
 
         internal CompletionManager UnprocessableCompletionManager => unprocessableCompletionManager;
@@ -1129,6 +1136,10 @@ public bool Configure(TextWriter log = null)
                 {
                     throw new TimeoutException();
                 }
+                else
+                {
+                    LastException = new TimeoutException("ConnectTimeout");
+                }
                 return false;
             }
             return task.Result;

StackExchange.Redis/StackExchange/Redis/ExceptionFactory.cs

@@ -102,7 +102,7 @@ internal static Exception NoConnectionAvailable(bool includeDetail, RedisCommand
                 serverSnapshot = new ServerEndPoint[] { server };
             }
 
-            var innerException = GetServerSnapshotInnerExceptions(serverSnapshot);
+            var innerException = PopulateInnerExceptions(serverSnapshot);
 
             StringBuilder exceptionmessage = new StringBuilder("No connection is available to service this operation: ");
             exceptionmessage.Append(commandLabel);
@@ -122,11 +122,16 @@ internal static Exception NoConnectionAvailable(bool includeDetail, RedisCommand
             return ex;
         }
 
-        internal static Exception GetServerSnapshotInnerExceptions(ServerEndPoint[] serverSnapshot)
+        internal static Exception PopulateInnerExceptions(ServerEndPoint[] serverSnapshot)
         {
             List<Exception> innerExceptions = new List<Exception>();
             if (serverSnapshot != null)
             {
+                if (serverSnapshot.Length > 0 && serverSnapshot[0].Multiplexer.LastException != null)
+                {
+                    innerExceptions.Add(serverSnapshot[0].Multiplexer.LastException);
+                }
+
                 for (int i = 0; i < serverSnapshot.Length; i++)
                 {
                     if (serverSnapshot[i].LastException != null)

StackExchange.Redis/StackExchange/Redis/ServerEndPoint.cs

@@ -101,7 +101,7 @@ internal Exception LastException
                 //check if subscription endpoint has a better lastexception
                 if (tmp2 != null && tmp2.LastException != null)
                 {
-                    if (!tmp2.LastException.Data["Redis-FailureType"].ToString().Equals(ConnectionFailureType.UnableToConnect.ToString()))
+                    if (tmp2.LastException.Data.Contains("Redis-FailureType") && !tmp2.LastException.Data["Redis-FailureType"].ToString().Equals(ConnectionFailureType.UnableToConnect.ToString()))
                     {
                         return tmp2.LastException;
                     }