Fix

Modbus.Net/Modbus.Net/TaskManager.cs

@@ -511,6 +511,8 @@ namespace Modbus.Net
         /// </summary>
         /// <returns></returns>
         private async Task MaintainTasks2Async()
+        {
+            try
             {
                 var tasks = new List<Task>();
                 HashSet<BaseMachine> saveMachines = new HashSet<BaseMachine>();
@@ -518,8 +520,6 @@ namespace Modbus.Net
                 {
                     saveMachines.UnionWith(_unlinkedMachines);
                 }
-            try
-            {
                 foreach (var machine in saveMachines)
                 {
                     CancellationTokenSource cts = new CancellationTokenSource();
@@ -527,7 +527,7 @@ namespace Modbus.Net
                     var task = _tasks.StartNew(() => RunTask(machine).WithCancellation(cts.Token));
                     tasks.Add(task);
                 }
-                await Task.WhenAll();
+                await Task.WhenAll(tasks);
             }
             catch
             {