1          Check
below entry in slave server:
            mysql>
show slave status\G;
Master_Log_File: mysql-bin.000006
            Read_Master_Log_Pos: 231202
                        Relay_Log_File:
mysqld-relay-bin.000004
                        Relay_Log_Pos: 503
            Relay_Master_Log_File: mysql-bin.000003
            Slave_IO_Running: Yes
            Slave_SQL_Running: No
Note:  
a)      Both Master_Log_File and Relay_Master_Log_File
must be same.
b)      Both Slave_IO_Running and Slave_SQL_Running
must be yes.
2          Check
file name and bin log position on master server:
mysql> show master status;
+------------------+----------+--------------+------------------+
| File             |
Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000006 |  
231202 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
3.         Stop
the slave server:
mysql> stop slave;
Query OK, 0 rows affected (0.00 sec)
4.         Change
master log file name and log position
mysql> CHANGE MASTER TO
MASTER_HOST='xxxxx.xxx.xx',MASTER_USER='master_user',MASTER_PASSWORD='master_user_password',MASTER_LOG_FILE='mysql-bin.000006',MASTER_LOG_POS=202;
Query OK, 0 rows affected (0.05 sec)
5.         Start
Slave Server:
mysql> start slave ;
Query OK, 0 rows affected (0.01 sec)
6.         Check
slave server status: 
mysql> show slave status\G;
            Master_Log_File: mysql-bin.000006
            Read_Master_Log_Pos: 231202
                        Relay_Log_File:
mysqld-relay-bin.000002
                        Relay_Log_Pos: 235
            Relay_Master_Log_File: mysql-bin.000006
            Slave_IO_Running:
Yes
            Slave_SQL_Running: Yes