MySQL 5.6主从Slave_IO_Running:Connecting/error connecting to master *- retry

刚配置的MySQL主从，在从机上看到

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mysql> SHOW slave STATUS \\G
*************************** 1. row ***************************
               Slave_IO_State: Connecting to master
                  Master_Host: 172.17.210.199
                  Master_User: my
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: masters-bin.000003
          Read_Master_Log_Pos: 1224
               Relay_Log_File: testmysql-relay-bin.000001
                Relay_Log_Pos: 4
        Relay_Master_Log_File: masters-bin.000003
             Slave_IO_Running: Connecting
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB:

• 看日志有很多：

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141010 0:02:48 [ERROR] Slave I/O: error connecting to master \'[email protected]:3306\' - retry-time: 60 retries: 1, Error_code: 2003
141010 0:03:48 [ERROR] Slave I/O: error connecting to master \'[email protected]:3306\' - retry-time: 60 retries: 2, Error_code: 2003
141010 0:04:48 [ERROR] Slave I/O: error connecting to master \'[email protected]:3306\' - retry-time: 60 retries: 3, Error_code: 2003
141010 0:05:48 [ERROR] Slave I/O: error connecting to master \'[email protected]:3306\' - retry-time: 60 retries: 4, Error_code: 2003
141010 0:06:48 [ERROR] Slave I/O: error connecting to master \'[email protected]:3306\' - retry-time: 60 retries: 5, Error_code: 2003
141010 0:07:48 [ERROR] Slave I/O: error connecting to master \'[email protected]:3306\' - retry-time: 60 retries: 6, Error_code: 2003

解决方法：

导致lave_IO_Running 为connecting 的原因主要有以下 3 个方面：

1、网络不通
2、密码不对
3、pos不对

解决步骤：
1、对于第一个问题，一般情况下都是可以排除的，也是最容易排除的。
2、在主库上修改用来复制的用户的密码。
3、 在做chang to 的时候注意log_pos 是否跟此时主机的一样。在主机上 show master status \G ;可以查看到

mysql> show master status \G;
*************************** 1. row ***************************
             File: masters-bin.000003
         Position: 2392
     Binlog_Do_DB: 
 Binlog_Ignore_DB: 
Executed_Gtid_Set: 
1 row in set (0.00 sec)

ERROR: 
No query specified
从机上面执行change to 的正确
CHANGE MASTER TO 
MASTER_HOST='172.17.210.199', 
MASTER_USER='my', 
MASTER_PASSWORD='123456', 
MASTER_LOG_FILE='masters-bin.000003', 
MASTER_LOG_POS= 2392;

我的问题，就是主机的防火墙没有关闭，犯了一个低级错误！！！！