diff --git a/samples/DtmSample/AppSettings.cs b/samples/DtmSample/AppSettings.cs
index 688e7e1..43bccbf 100644
--- a/samples/DtmSample/AppSettings.cs
+++ b/samples/DtmSample/AppSettings.cs
@@ -2,10 +2,15 @@
 {
     public class AppSettings
     {
+        public string DtmUrl { get; set; }
+    
         public string BusiUrl { get; set; }
 
         public string SqlBarrierConn { get; set; }
 
+
+        public string SqlBarrierErrorConn { get; set; }
+        
         public string MongoBarrierConn { get; set; }
     }
 }
diff --git a/samples/DtmSample/Controllers/MsgTestController.cs b/samples/DtmSample/Controllers/MsgTestController.cs
index a6efcd0..36decaa 100644
--- a/samples/DtmSample/Controllers/MsgTestController.cs
+++ b/samples/DtmSample/Controllers/MsgTestController.cs
@@ -1,4 +1,5 @@
-using System.Net;
+using System;
+using System.Net;
 using Dtmcli;
 using DtmMongoBarrier;
 using DtmSample.Dtos;
@@ -37,6 +38,9 @@ public MsgTestController(ILogger<MsgTestController> logger, IOptions<AppSettings
         private MySqlConnection GetMysqlConn() => new(_settings.SqlBarrierConn);
 
         private SqlConnection GetMssqlConn() => new(_settings.SqlBarrierConn);
+        
+        private SqlConnection GetBadMssqlConn() => new(_settings.SqlBarrierErrorConn);
+
 
         private MySqlConnection GetErrConn() => new("");
 
@@ -116,6 +120,40 @@ await msg.DoAndSubmitDB(_settings.BusiUrl + "/msg-mssqlqueryprepared", conn, asy
             return Ok(TransResponse.BuildSucceedResponse());
         }
 
+
+        /// <summary>
+        /// MSG DoAndSubmitDB (mssql). db connection error, DTM server Status should be prepared. 
+        /// </summary>
+        /// <param name="cancellationToken"></param>
+        /// <returns></returns>
+        [HttpPost("msg-db-mssql-db-connection-error")]
+        public async Task<IActionResult> MsgDbMsSql_DbConnectionError(CancellationToken cancellationToken)
+        {
+            var gid = await _dtmClient.GenGid(cancellationToken);
+
+            var msg = _transFactory.NewMsg(gid)
+                .Add(_settings.BusiUrl + "/TransOut", new TransRequest("1", -30))
+                .Add(_settings.BusiUrl + "/TransIn", new TransRequest("2", 30));
+
+            try
+            {
+                using (SqlConnection conn = GetBadMssqlConn())
+                {
+                    await msg.DoAndSubmitDB(_settings.BusiUrl + "/msg-mssqlqueryprepared", conn, async tx => { await Task.CompletedTask; });
+                }
+            }
+            catch (SqlException e)
+            {
+                Thread.Sleep(5 * 1000);
+                _logger.LogInformation("{}/admin/global-transactions/detail/{}, status should be prepared", _settings.DtmUrl, gid);
+                throw;
+            }
+
+            _logger.LogInformation("result gid is {0}", gid);
+            return Ok(TransResponse.BuildSucceedResponse());
+        }
+
+
         /// <summary>
         /// MSG DoAndSubmit (mongo)
         /// </summary>
diff --git a/samples/DtmSample/appsettings.json b/samples/DtmSample/appsettings.json
index 5916f0c..50bd3dd 100644
--- a/samples/DtmSample/appsettings.json
+++ b/samples/DtmSample/appsettings.json
@@ -24,6 +24,7 @@
     "SqlDbType": "sqlserver",
     "BarrierSqlTableName": "dbo.barrier",
     "SqlBarrierConn": "Data Source=(localdb)\\MSSQLLocalDB;Initial Catalog=dtm_barrier;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False",
+    "SqlBarrierErrorConn": "Data Source=.;Initial Catalog=dtm_barrier;User ID=sa;Password=my_error_password;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False",
     "MongoBarrierConn": "mongodb://localhost:27017"
   }
 }
\ No newline at end of file