Disable mysql replication on rds

I want set up replication between an Amazon RDS MySQL DB instance and a MySQL instance that is external to Amazon RDS.

but Slave_IO_Running: Connecting how to solve this problem?

I have already done the following commands.

mysql>CALL mysql.rds_set_external_master ('192.168.xx.xxx', 3306,
    'repl2', '111111', 'mysql-bin-changelog.000003', 598, 0); 

mysql> CALL mysql.rds_start_replication; 

+-------------------------+
| Message                 |
+-------------------------+
| Slave running normally. |
+-------------------------+
1 row in set (1.01 sec)