The following error occurred:

PDOException: SQLSTATE[HY000] [1129] Host '172.18.0.4' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts' in /var/www/html/library/Zend/Db/Adapter/Pdo/Abstract.php:128 Stack trace: #0 /var/www/html/library/Zend/Db/Adapter/Pdo/Abstract.php(128): PDO->__construct('mysql:host=mysq...', 'baza_ssakow', '2grosAtBojlap(', Array) #1 /var/www/html/library/Zend/Db/Adapter/Pdo/Mysql.php(111): Zend_Db_Adapter_Pdo_Abstract->_connect() #2 /var/www/html/library/Zend/Db/Adapter/Abstract.php(460): Zend_Db_Adapter_Pdo_Mysql->_connect() #3 /var/www/html/library/Zend/Db/Adapter/Pdo/Abstract.php(238): Zend_Db_Adapter_Abstract->query('SELECT rola FRO...', NULL) #4 /var/www/html/library/Zend/Db/Adapter/Abstract.php(828): Zend_Db_Adapter_Pdo_Abstract->query('SELECT rola FRO...', NULL) #5 /var/www/html/application/controllers/IndexController.php(22): Zend_Db_Adapter_Abstract->fetchOne('SELECT rola FRO...', NULL) #6 /var/www/html/library/Zend/Controller/Action.php(133): IndexController->init() #7 /var/www/html/library/Zend/Controller/Dispatcher/Standard.php(281): Zend_Controller_Action->__construct(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http), Array) #8 /var/www/html/library/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http)) #9 /var/www/html/library/Zend/Application/Bootstrap/Bootstrap.php(105): Zend_Controller_Front->dispatch() #10 /var/www/html/library/Zend/Application.php(384): Zend_Application_Bootstrap_Bootstrap->run() #11 /var/www/html/public/index.php(26): Zend_Application->run() #12 {main} Next Zend_Db_Adapter_Exception: SQLSTATE[HY000] [1129] Host '172.18.0.4' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts' in /var/www/html/library/Zend/Db/Adapter/Pdo/Abstract.php:144 Stack trace: #0 /var/www/html/library/Zend/Db/Adapter/Pdo/Mysql.php(111): Zend_Db_Adapter_Pdo_Abstract->_connect() #1 /var/www/html/library/Zend/Db/Adapter/Abstract.php(460): Zend_Db_Adapter_Pdo_Mysql->_connect() #2 /var/www/html/library/Zend/Db/Adapter/Pdo/Abstract.php(238): Zend_Db_Adapter_Abstract->query('SELECT rola FRO...', NULL) #3 /var/www/html/library/Zend/Db/Adapter/Abstract.php(828): Zend_Db_Adapter_Pdo_Abstract->query('SELECT rola FRO...', NULL) #4 /var/www/html/application/controllers/IndexController.php(22): Zend_Db_Adapter_Abstract->fetchOne('SELECT rola FRO...', NULL) #5 /var/www/html/library/Zend/Controller/Action.php(133): IndexController->init() #6 /var/www/html/library/Zend/Controller/Dispatcher/Standard.php(281): Zend_Controller_Action->__construct(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http), Array) #7 /var/www/html/library/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http)) #8 /var/www/html/library/Zend/Application/Bootstrap/Bootstrap.php(105): Zend_Controller_Front->dispatch() #9 /var/www/html/library/Zend/Application.php(384): Zend_Application_Bootstrap_Bootstrap->run() #10 /var/www/html/public/index.php(26): Zend_Application->run() #11 {main}