I got following error in a PHP Application
Warning: mysql_connect() [function.mysql-connect]: Host 'server10.hosthat.com' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts' in /home/hon/public_html/cp/admin/approve.php on line 6 Unable to connect to mysql server
This is because MySQL server blocked remote server due to connection errors.
Default max_connect_errors value is 10, that is remote host will be blocked if there is more than 10 connection errors.
To fix, run
on server running MySQL server.
To avoid this happening again, edit my.cnf
set-variable = max_connect_errors=5000
[root@server12 ~]# cat /etc/my.cnf [mysqld] datadir=/backup/mysql socket=/var/lib/mysql/mysql.sock user=mysql set-variable = max_connections=500 set-variable = max_connect_errors=5000 old_passwords=1 safe-show-database skip-locking skip-innodb max_allowed_packet = 1M set-variable = table_cache=1024 set-variable = query_cache_type=1 set-variable = query_cache_limit=1M set-variable = query_cache_size=128M ## 32MB for every 1GB of RAM [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid [mysql] socket=/var/lib/mysql/mysql.sock [mysqladmin] socket=/var/lib/mysql/mysql.sock [mysqldump] socket=/var/lib/mysql/mysql.sock [root@server12 ~]#