diff --git a/Class/AsyncTcpServer.cs b/Class/AsyncTcpServer.cs
index a6c6cf9..692853b 100644
--- a/Class/AsyncTcpServer.cs
+++ b/Class/AsyncTcpServer.cs
@@ -30,7 +30,17 @@ namespace ForwardingServerUI.Class
             //TcpService service = new TcpService();
             service.Connecting = (client, e) => { return EasyTask.CompletedTask; };//有客户端正在连接
             service.Connected = (client, e) => {return EasyTask.CompletedTask;};//有客户端成功连接
-            service.Closing = (client, e) => {return EasyTask.CompletedTask; };//有客户端正在断开连接，只有当主动断开时才有效。
+            service.Closing = (client, e) => {   //离线记录
+                DataRow[] dat = MainWindowViewModel._machineTable.Select("ID='" + client.Id + "'");
+                foreach (DataRow row in dat)
+                {
+                    Application.Current.Dispatcher.Invoke(() => {
+                        MainWindowViewModel._machineTable.Rows.Remove(row);
+                    });
+                }
+                Console.WriteLine("[" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + "] NOT ID " + client.Id + " IP " + client.IP);
+
+                return EasyTask.CompletedTask; };//有客户端正在断开连接，只有当主动断开时才有效。
             service.Closed =  (client, e) => {
                 //离线记录
                 DataRow[] dat = MainWindowViewModel._machineTable.Select("ID='"+client.Id+"'");
@@ -40,7 +50,7 @@ namespace ForwardingServerUI.Class
                         MainWindowViewModel._machineTable.Rows.Remove(row);
                     });
                 }
-                Console.WriteLine("[" + DateTime.Now.ToString("yyyy-MM-DD HH:mm:ss:fff") + "] NOT ID " + client.Id + " IP " + client.IP);
+                Console.WriteLine("[" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + "] NOT ID " + client.Id + " IP " + client.IP);
 
                 return EasyTask.CompletedTask; 
             };//有客户端断开连接
@@ -62,6 +72,7 @@ namespace ForwardingServerUI.Class
                                     (trimmedDat[0] == '{' || trimmedDat[0] == '['))
                                 {
                                     MainWindowViewModel.Person deserializedPerson = JsonSerializer.Deserialize<MainWindowViewModel.Person>(trimmedDat)!;
+                                    
                                     //转发逻辑
                                     var dr = MainWindowViewModel._userTable.Select("Terminal='" + deserializedPerson.Terminal + "'");
                                     if (dr.Length > 0)
@@ -74,16 +85,28 @@ namespace ForwardingServerUI.Class
                                     }
                                 }
 
-                            } else if (s_ == 90) { }
+                            }
+                            else if (s_ == 90)
+                            { }
+                            Application.Current.Dispatcher.Invoke(() =>
+                            {
+                                DataRow drEmployee = r_.First();
+                                drEmployee.BeginEdit();
+                                drEmployee["HeartbeatTime"] = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff");
+                                drEmployee.EndEdit();
+                                drEmployee.AcceptChanges();
+                            });
                         }
                         else
                         {
                             Personm deserializedPerson = JsonSerializer.Deserialize<Personm>(DAT)!;
-                            Application.Current.Dispatcher.Invoke(() => { 
-                               var mach = MainWindowViewModel._machineTable.Select("Enterprise='" + deserializedPerson.SERVEREnterprise +
-                                  "'and MachineName='" + deserializedPerson.SERVERMachineName + "'");
+                            Application.Current.Dispatcher.Invoke(() =>
+                            {
+                                var mach = MainWindowViewModel._machineTable.Select("Enterprise='" + deserializedPerson.SERVEREnterprise +
+                                   "'and MachineName='" + deserializedPerson.SERVERMachineName + "'");
                                 if (mach.Length > 0)
-                                {//刷新设备信息表
+                                {
+                                    //刷新设备信息表
                                     DataRow dataRow = mach.First();
                                     dataRow.BeginEdit();
                                     dataRow["ID"] = client.Id;
@@ -96,14 +119,14 @@ namespace ForwardingServerUI.Class
                                     dataRow.AcceptChanges();
                                 }
                                 else
-                                {//添加设备信息表
-                            MainWindowViewModel._machineTable.Rows.Add(client.Id, client.IP, 30, "/" + deserializedPerson.SERVEREnterprise,
-                                deserializedPerson.SERVERMachineName, deserializedPerson.MachineVer);
-                                  
+                                {
+                                    //添加设备信息表
+                                    MainWindowViewModel._machineTable.Rows.Add(client.Id, client.IP, 30, "/" + deserializedPerson.SERVEREnterprise,
+                                        deserializedPerson.SERVERMachineName, DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff"), deserializedPerson.MachineVer);
                                 }
                             });
-                            Console.WriteLine("[" + DateTime.Now.ToString("yyyy-MM-DD HH:mm:ss:fff") + " [LINK ID " + client.Id + " IP " + client.IP + "]\nDATA =" + DAT);
-                      
+                            Console.WriteLine("[" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff") + " [LINK ID " + client.Id + " IP " + client.IP + "]\nDATA =" + DAT);
+
                         }
                     }
                 }
@@ -133,7 +156,50 @@ namespace ForwardingServerUI.Class
             await service.StartAsync();//启动
 
             Console.WriteLine("TcpServer:Run");
-        }  
-      
+
+            Timer timer = new Timer(TimerCallback, null, TimeSpan.FromSeconds(90), TimeSpan.FromSeconds(30));
+        }
+              
+        private static async void TimerCallback(object? state)
+        {
+            try
+            {
+                int rows = MainWindowViewModel._machineTable.Rows.Count;
+                for (int i = rows; i > 0; i--)
+                {
+                    DataRow dataRow = MainWindowViewModel._machineTable.Rows[i];
+                    DateTime dateTime = DateTime.Parse(dataRow["HeartbeatTime"].ToString()!);
+                    if (DateTime.Now > dateTime.AddSeconds(180))
+                    {
+                        //标记无回应连接
+                        await Application.Current.Dispatcher.Invoke(async () =>
+                        {
+                            dataRow.BeginEdit();
+                            dataRow["Start"] = 999;
+                            dataRow.EndEdit();
+                            dataRow.AcceptChanges();                            
+                        });
+                        
+                        //关闭无回应连接
+                        foreach (var item in service.Clients)
+                        {
+                            if (item.Id == dataRow["ID"].ToString())
+                            {
+                                await item.CloseAsync();
+
+                                //在断开连接后，释放对象。
+                                item.Dispose();
+                            }
+                        }
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(ex.ToString());
+                LogGing.ERRDATA(ex);
+            }
+        }
+
     }      
 }
diff --git a/MainWindowViewModel.cs b/MainWindowViewModel.cs
index b9d80cf..9c8b36e 100644
--- a/MainWindowViewModel.cs
+++ b/MainWindowViewModel.cs
@@ -6,6 +6,7 @@ using System;
 using System.Collections.Generic;
 using System.Data;
 using System.Text;
+using TouchSocket.Sockets;
 
 namespace ForwardingServerUI
 {
@@ -32,6 +33,7 @@ namespace ForwardingServerUI
             _machineTable.Columns.Add("Start", typeof(int));
             _machineTable.Columns.Add("Enterprise", typeof(string));
             _machineTable.Columns.Add("MachineName", typeof(string));
+            _machineTable.Columns.Add("HeartbeatTime", typeof(string));
             _machineTable.Columns.Add("MachineVer", typeof(string));
 
 
@@ -52,5 +54,7 @@ namespace ForwardingServerUI
         {
             Data();
         }
+
+      
     }
 }