Oracle Dependency for Change Notification in .NET Project

I'm not having any luck getting the change notification back from the DB server. My local firewall is off. We're wondering if there are any other environmental/machine settings that would be preventing the change notification from returning?

My user has CHANGE NOTIFICATION rights on the database. Server is 11.2.0.2.0 and ODP.NET files are 2.112.1.2.

var con = new OracleConnection(constr);
        开发者_StackOverflow中文版        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...");