PDO Connection Error: SQLSTATE[HY000] [2002] Connection refused

#0 /libs/Doctrine/Connection/Mysql.php(101): Doctrine_Connection->connect()
#1 /libs/Doctrine/Connection.php(1037): Doctrine_Connection_Mysql->connect()
#2 /libs/Doctrine/Connection/Mysql.php(126): Doctrine_Connection->exec('SET NAMES 'utf8...')
#3 /libs/App/common/Application/Resource/Doctrine.php(255): Doctrine_Connection_Mysql->setCharset('utf8')
#4 /libs/App/common/Application/Resource/Doctrine.php(374): App_Application_Resource_Doctrine->_initConnections()
#5 /libs/Zend/Application/Bootstrap/BootstrapAbstract.php(683): App_Application_Resource_Doctrine->init()
#6 /libs/Zend/Application/Bootstrap/BootstrapAbstract.php(629): Zend_Application_Bootstrap_BootstrapAbstract->_executeResource('Doctrine')
#7 /libs/Zend/Application/Bootstrap/BootstrapAbstract.php(586): Zend_Application_Bootstrap_BootstrapAbstract->_bootstrap('Doctrine')
#8 /application/client/Bootstrap.php(61): Zend_Application_Bootstrap_BootstrapAbstract->bootstrap('Doctrine')
#9 /libs/Zend/Application/Bootstrap/BootstrapAbstract.php(669): Bootstrap->_initAutoloader()
#10 /libs/Zend/Application/Bootstrap/BootstrapAbstract.php(622): Zend_Application_Bootstrap_BootstrapAbstract->_executeResource('autoloader')
#11 /libs/Zend/Application/Bootstrap/BootstrapAbstract.php(586): Zend_Application_Bootstrap_BootstrapAbstract->_bootstrap(NULL)
#12 /libs/Zend/Application.php(355): Zend_Application_Bootstrap_BootstrapAbstract->bootstrap(NULL)
#13 /index.php(61): Zend_Application->bootstrap()
#14 {main}