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Application error

Exception information:

Message: SQLSTATE[HY000] [2003] Can't connect to MySQL server on '172.26.4.6' (99)

Stack trace:

#0 /var/library/Zend/Db/Adapter/Pdo/Mysql.php(96): Zend_Db_Adapter_Pdo_Abstract->_connect()
#1 /var/library/Custom/Db/Adapter.php(53): Zend_Db_Adapter_Pdo_Mysql->_connect()
#2 /var/library/Zend/Db/Adapter/Abstract.php(448): Custom_Db_Adapter->_connect()
#3 /var/library/Zend/Db/Adapter/Pdo/Abstract.php(238): Zend_Db_Adapter_Abstract->query(Object(Zend_Db_Table_Select), Array)
#4 /var/library/Zend/Db/Select.php(686): Zend_Db_Adapter_Pdo_Abstract->query(Object(Zend_Db_Table_Select))
#5 /var/library/Custom/Model/Abstract.php(441): Zend_Db_Select->query()
#6 /var/library/Common/Controller/Action.php(451): Custom_Model_Abstract->get_all('types', Array)
#7 /var/library/Common/Controller/Action.php(390): type_id2Type('98')
#8 /var/library/Common/Controller/Action.php(335): href('book', 'oku', Array)
#9 /webpages/harunyahya.com/htdocs/apidev/modules/onyuz/application/views/scripts/onyuzelements/getLine.phtml(136): l('Claudia Bandion...', Array)
#10 /var/library/Zend/View.php(108): include('/webpages/harun...')
#11 /var/library/Zend/View/Abstract.php(880): Zend_View->_run('/webpages/harun...')
#12 /webpages/harunyahya.com/htdocs/apidev/modules/onyuz/application/controllers/IndexController.php(375): Zend_View_Abstract->render('onyuzelements/g...')
#13 /var/library/Zend/Controller/Action.php(513): IndexController->listAction()
#14 /var/library/Zend/Controller/Dispatcher/Standard.php(295): Zend_Controller_Action->dispatch('listAction')
#15 /var/library/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#16 /var/library/Zend/Application/Bootstrap/Bootstrap.php(97): Zend_Controller_Front->dispatch()
#17 /var/library/Zend/Application.php(366): Zend_Application_Bootstrap_Bootstrap->run()
#18 /webpages/harunyahya.com/htdocs/apidev/modules/onyuz/public/index.php(69): Zend_Application->run()
#19 {main}  

Request Parameters:

array (
  'type' => '98',
  'A2Z' => 'C',
  'limit' => '100000',
  'controller' => 'index',
  'action' => 'list',
  'lang' => 'tr',
)