amazon linux ami apache2 mysql error log - many connection errors

amazon linux ami apache2 mysql error log:

An error occurred

Application error

Exception information:

Message: SQLSTATE[HY000] [1129] Host 'ip-10-170-69-209.us-west-1.compute.internal' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'

Stack trace:

reloved in ssh:

mysqladmin flush-hosts

or resloved in mysqladmin:

flush hosts