Initialization Error

Array
(
    [callback] => Array
        (
            [0] => CRM_Core_Error
            [1] => simpleHandler
        )

    [code] => -24
    [message] => DB Error: connect failed
    [mode] => 16
    [debug_info] =>  [nativecode=Can't connect to MySQL server on '192.168.91.9' (111)]
    [type] => DB_Error
    [user_info] =>  [nativecode=Can't connect to MySQL server on '192.168.91.9' (111)]
    [to_string] => [db_error: message="DB Error: connect failed" code=-24 mode=callback callback=CRM_Core_Error::simpleHandler prefix="" info=" [nativecode=Can't connect to MySQL server on '192.168.91.9' (111)]"]
)

backTrace

/var/www/html/drupal/sites/all/modules/civicrm/CRM/Core/Error.php, backtrace, 235
, simpleHandler, 
/var/www/html/drupal/sites/all/modules/civicrm/packages/PEAR.php, call_user_func, 931
/var/www/html/drupal/sites/all/modules/civicrm/packages/DB.php, PEAR_Error, 968
/var/www/html/drupal/sites/all/modules/civicrm/packages/PEAR.php, DB_Error, 564
/var/www/html/drupal/sites/all/modules/civicrm/packages/DB/common.php, raiseError, 1903
/var/www/html/drupal/sites/all/modules/civicrm/packages/DB/mysqli.php, raiseError, 338
/var/www/html/drupal/sites/all/modules/civicrm/packages/DB.php, connect, 558
/var/www/html/drupal/sites/all/modules/civicrm/packages/DB/DataObject.php, connect, 2291
/var/www/html/drupal/sites/all/modules/civicrm/packages/DB/DataObject.php, _connect, 2529
/var/www/html/drupal/sites/all/modules/civicrm/packages/DB/DataObject.php, _build_condition, 411
/var/www/html/drupal/sites/all/modules/civicrm/CRM/Core/BAO/Setting.php, find, 209
/var/www/html/drupal/sites/all/modules/civicrm/CRM/Core/Config.php, retrieve, 397
/var/www/html/drupal/sites/all/modules/civicrm/CRM/Core/Config.php, _initVariables, 202
/var/www/html/drupal/sites/all/modules/civicrm/drupal/civicrm.module, singleton, 272
/var/www/html/drupal/sites/all/modules/civicrm/drupal/civicrm.module, civicrm_initialize, 908
, civicrm_preprocess_page, 
/var/www/html/drupal/includes/theme.inc, call_user_func_array, 710
/var/www/html/drupal/index.php, theme, 36