Notifications .NET项目中更改通知的Oracle依赖项

我没有任何运气从DB服务器得到更改通知。我的本地防火墙关闭了。我们想知道是否有任何其他环境/机器设置会阻止更改通知返回

我的用户对数据库具有更改通知权限。服务器为11.2.0.2.0，ODP.NET文件为2.112.1.2

var con = new OracleConnection(constr);
                OracleDependency dep = null;
                var cmd = new OracleCommand("select col1, col2, col3 from gline.test", con);
                con.Open();
                //OracleDependency.Port = 1005;

                dep = new OracleDependency();
                dep.OnChange += new OnChangeEventHandler(OnMyNotificaton);

                dep.QueryBasedNotification = false;
                dep.AddCommandDependency(cmd);
                cmd.Notification.IsNotifiedOnce = false;
                cmd.AddRowid = true;

                cmd.ExecuteNonQuery();

                var txn = con.BeginTransaction();
                string updateCmdText = "update gline.test set col1 = 1, col2 = 2, col3 = 3 where col1 = 1";
                OracleCommand updateCmd = new OracleCommand(updateCmdText, con);
                updateCmd.ExecuteNonQuery();
                txn.Commit();
                Console.WriteLine("updated gline.test");
                Console.WriteLine("Waiting for change notification...");