diff --git a/BMA.EHR.Domain/Middlewares/ErrorHandlerMiddleware.cs b/BMA.EHR.Domain/Middlewares/ErrorHandlerMiddleware.cs
index 4ef7672f..af1ce4fb 100644
--- a/BMA.EHR.Domain/Middlewares/ErrorHandlerMiddleware.cs
+++ b/BMA.EHR.Domain/Middlewares/ErrorHandlerMiddleware.cs
@@ -7,23 +7,13 @@ namespace BMA.EHR.Domain.Middlewares
 {
     public class ErrorHandlerMiddleware
     {
-        #region " Fields "
-
         private readonly RequestDelegate _next;
 
-        #endregion
-
-        #region " Constructor and Destructor "
-
         public ErrorHandlerMiddleware(RequestDelegate next)
         {
             _next = next;
         }
 
-        #endregion
-
-        #region " Methods "
-
         public async Task Invoke(HttpContext context)
         {
             try
@@ -31,58 +21,57 @@ namespace BMA.EHR.Domain.Middlewares
                 await _next(context);
 
                 var response = context.Response;
-                
+                var statusCode = response.StatusCode;
 
-                var responseModel = new ResponseObject();
-                responseModel.Status = response.StatusCode;
+                if (!response.HasStarted &&
+                    (statusCode == (int)HttpStatusCode.Unauthorized || statusCode == (int)HttpStatusCode.Forbidden))
+                {
+                    var responseModel = new ResponseObject
+                    {
+                        Status = statusCode,
+                        Message = statusCode == (int)HttpStatusCode.Unauthorized
+                            ? GlobalMessages.NotAuthorized
+                            : GlobalMessages.ForbiddenAccess
+                    };
 
-                if (responseModel.Status == (int)HttpStatusCode.Unauthorized)
-                {
                     response.ContentType = "application/json";
-                    responseModel.Message = GlobalMessages.NotAuthorized;
-                    await response.WriteAsJsonAsync(responseModel);
-                }
-                if (responseModel.Status == (int)HttpStatusCode.Forbidden)
-                {
-                    response.ContentType = "application/json";
-                    responseModel.Message = GlobalMessages.ForbiddenAccess;
                     await response.WriteAsJsonAsync(responseModel);
                 }
             }
             catch (Exception error)
             {
                 var response = context.Response;
-                response.ContentType = "application/json";
 
-                var responseModel = new ResponseObject();
-                responseModel.Status = response.StatusCode;
-                var msg = error.Message;
-                var inner = error.InnerException;
-                while (inner != null)
+                if (!response.HasStarted)
                 {
-                    msg += $" {inner.Message}\r\n";
-                    inner = inner.InnerException;
-                }
-                responseModel.Result = msg;
+                    response.Clear();
+                    response.ContentType = "application/json";
+                    response.StatusCode = (int)HttpStatusCode.InternalServerError;
 
-                switch (response.StatusCode)
-                {
-                    case (int)HttpStatusCode.Unauthorized:
-                        responseModel.Message = GlobalMessages.NotAuthorized;
-                        break;
-                    case (int)HttpStatusCode.Forbidden:
-                        responseModel.Message = GlobalMessages.ForbiddenAccess;
-                        break;
-                    default:
-                        response.StatusCode = (int)HttpStatusCode.InternalServerError;
-                        responseModel.Status = (int)HttpStatusCode.InternalServerError;
-                        responseModel.Message = GlobalMessages.ExceptionOccured;
-                        break;
+                    var msg = error.Message;
+                    var inner = error.InnerException;
+                    while (inner != null)
+                    {
+                        msg += $" {inner.Message}\r\n";
+                        inner = inner.InnerException;
+                    }
+
+                    var responseModel = new ResponseObject
+                    {
+                        Status = response.StatusCode,
+                        Message = GlobalMessages.ExceptionOccured,
+                        Result = msg
+                    };
+
+                    await response.WriteAsJsonAsync(responseModel);
+                }
+                else
+                {
+                    // logging กรณีที่ response เริ่มถูกส่งแล้ว
+                    Console.WriteLine("Cannot write error response, stream already started.");
+                    Console.WriteLine(error);
                 }
-                await response.WriteAsJsonAsync(responseModel);
             }
         }
-
-        #endregion
     }
 }
diff --git a/BMA.EHR.Placement.Service/appsettings.json b/BMA.EHR.Placement.Service/appsettings.json
index f40436b3..6213c84c 100644
--- a/BMA.EHR.Placement.Service/appsettings.json
+++ b/BMA.EHR.Placement.Service/appsettings.json
@@ -15,11 +15,14 @@
     },
     "AllowedHosts": "*",
     "ConnectionStrings": {
-        //"DefaultConnection": "User Id=sys;Password=P@ssw0rd;DBA Privilege=SYSDBA;Data Source=localhost:1521/ORCLCDB",
-        "DefaultConnection": "server=192.168.1.80;user=root;password=adminVM123;port=3306;database=hrms;Convert Zero Datetime=True;Allow User Variables=true;Pooling=True;"
+        "LeaveConnection": "server=192.168.1.80;user=root;password=adminVM123;port=3306;database=hrms_leave;Convert Zero Datetime=True;Allow User Variables=true;Pooling=True;",
+        "MongoConnection": "mongodb://admin:adminVM123@192.168.1.80:27017",
+        "DefaultConnection": "server=192.168.1.80;user=root;password=adminVM123;database=hrms;Convert Zero Datetime=True;Allow User Variables=true;Pooling=True;",
+        "RecruitConnection": "server=192.168.1.80;user=root;password=adminVM123;database=hrms_recruit;Convert Zero Datetime=True;Allow User Variables=true;Pooling=True;",
+        "ExamConnection": "server=192.168.1.80;user=root;password=adminVM123;database=hrms_exam;Convert Zero Datetime=True;Allow User Variables=true;Pooling=True;"
     },
     "Jwt": {
-        "Key": "HP-FnQMUj9msHMSD3T9HtdEnphAKoCJLEl85CIqROFI",
+        "Key": "Hp3234M8rH1KjIdvhlUStayo6vIUOIeI76NKyIsiXJ8",
         "Issuer": "https://id.frappet.synology.me/realms/hrms"
     },
     "EPPlus": {