MySQL Master-Slave-Slave Configuration -error 1236
If you want to replicate from the existing 5.6 slave to another 5.6 slave, you need to setup the first 5.6 slave to behave like a master

STEP 01

Add these three(3) lines to my.cnf (under [mysqld] group header) on the first 5.6 slave

[mysqld]
log-bin=mysql-bin
log-slave-updates
skip-slave-start


STEP 02

Restart mysql on the first 5.6 slave

service mysql restart


Now, the first 5.6 slave has its own binary logs

STEP 03

Reset Binary Logs on the first 5.6 slave

mysql&gt; RESET MASTER;


STEP 04

On the second 5.6 Slave, setup replication to the first 5.6 slave as follows:

STOP SLAVE;
CHANGE MASTER TO MASTER_HOST='existing slave',
MASTER_USER='xxx',
MASTER_PASSWORD='xxx',
MASTER_LOG_FILE='mysql-bin.000001',
MASTER_LOG_POS=4;
START SLAVE;


STEP 5

Start replication on the first 5.6 slave

mysql&gt; START SLAVE;


STEP 6

Verify that Replication is running on both 5.6 Slaves

mysql&gt; SHOW SLAVE STATUS\G


If you see Slave_IO_Running: Yes, Slave_SQL_Running: Yes, and Seconds_Behind_Master is a number (preferably 0), CONGRATULATIONS !!!

GIVE IT A TRY !!!