HEC MBA - Event RegistrationError Page

The following error occurred:

exception 'PDOException' with message 'SQLSTATE[HY000] [2003] Can't connect to MySQL server on '10.0.0.251' (99)' in /var/www/library/ZendFramework-1.10.4-minimal/library/Zend/Db/Adapter/Pdo/Abstract.php:129
Stack trace:
#0 /var/www/library/ZendFramework-1.10.4-minimal/library/Zend/Db/Adapter/Pdo/Abstract.php(129): PDO->__construct('mysql:host=10.0...', 'root', 'dodgy', Array)
#1 /var/www/library/ZendFramework-1.10.4-minimal/library/Zend/Db/Adapter/Pdo/Mysql.php(96): Zend_Db_Adapter_Pdo_Abstract->_connect()
#2 /var/www/library/ZendFramework-1.10.4-minimal/library/Zend/Db/Adapter/Abstract.php(448): Zend_Db_Adapter_Pdo_Mysql->_connect()
#3 /var/www/library/ZendFramework-1.10.4-minimal/library/Zend/Db/Adapter/Pdo/Abstract.php(238): Zend_Db_Adapter_Abstract->query('INSERT INTO `se...', Array)
#4 /var/www/library/ZendFramework-1.10.4-minimal/library/Zend/Db/Adapter/Abstract.php(546): Zend_Db_Adapter_Pdo_Abstract->query('INSERT INTO `se...', Array)
#5 /var/www/htdocs/topapplyv2beta/application/default/models/Ta/Log.php(134): Zend_Db_Adapter_Abstract->insert('session_timeout...', Array)
#6 /var/www/htdocs/topapplyv2beta/application/default/models/Ta/TaControllerPlugIn.php(125): Ta_Log::logSessionExpire(Object(Zend_Controller_Request_Http), Array)
#7 /var/www/library/ZendFramework-1.10.4-minimal/library/Zend/Controller/Plugin/Broker.php(309): TaControllerPlugIn->preDispatch(Object(Zend_Controller_Request_Http))
#8 /var/www/library/ZendFramework-1.10.4-minimal/library/Zend/Controller/Front.php(941): Zend_Controller_Plugin_Broker->preDispatch(Object(Zend_Controller_Request_Http))
#9 /var/www/htdocs/topapplyv2beta/html/index.php(224): Zend_Controller_Front->dispatch()
#10 {main}

Next exception 'Zend_Db_Adapter_Exception' with message 'SQLSTATE[HY000] [2003] Can't connect to MySQL server on '10.0.0.251' (99)' in /var/www/library/ZendFramework-1.10.4-minimal/library/Zend/Db/Adapter/Pdo/Abstract.php:144
Stack trace:
#0 /var/www/library/ZendFramework-1.10.4-minimal/library/Zend/Db/Adapter/Pdo/Mysql.php(96): Zend_Db_Adapter_Pdo_Abstract->_connect()
#1 /var/www/library/ZendFramework-1.10.4-minimal/library/Zend/Db/Adapter/Abstract.php(448): Zend_Db_Adapter_Pdo_Mysql->_connect()
#2 /var/www/library/ZendFramework-1.10.4-minimal/library/Zend/Db/Adapter/Pdo/Abstract.php(238): Zend_Db_Adapter_Abstract->query('INSERT INTO `se...', Array)
#3 /var/www/library/ZendFramework-1.10.4-minimal/library/Zend/Db/Adapter/Abstract.php(546): Zend_Db_Adapter_Pdo_Abstract->query('INSERT INTO `se...', Array)
#4 /var/www/htdocs/topapplyv2beta/application/default/models/Ta/Log.php(134): Zend_Db_Adapter_Abstract->insert('session_timeout...', Array)
#5 /var/www/htdocs/topapplyv2beta/application/default/models/Ta/TaControllerPlugIn.php(125): Ta_Log::logSessionExpire(Object(Zend_Controller_Request_Http), Array)
#6 /var/www/library/ZendFramework-1.10.4-minimal/library/Zend/Controller/Plugin/Broker.php(309): TaControllerPlugIn->preDispatch(Object(Zend_Controller_Request_Http))
#7 /var/www/library/ZendFramework-1.10.4-minimal/library/Zend/Controller/Front.php(941): Zend_Controller_Plugin_Broker->preDispatch(Object(Zend_Controller_Request_Http))
#8 /var/www/htdocs/topapplyv2beta/html/index.php(224): Zend_Controller_Front->dispatch()
#9 {main}