Connection to Redis failed after 2 failures.Last Error : (111) Connection refused

#0 /var/www/webroot/ROOT/lib/Credis/Client.php(439): Credis_Client->connect()
#1 /var/www/webroot/ROOT/lib/Credis/Client.php(1017): Credis_Client->connect()
#2 /var/www/webroot/ROOT/lib/Credis/Client.php(824): Credis_Client->write_command('*3\r\n$4\r\nhget\r\n$...')
#3 /var/www/webroot/ROOT/lib/Cm/Cache/Backend/Redis.php(300): Credis_Client->__call('hget', Array)
#4 /var/www/webroot/ROOT/lib/Zend/Cache/Core.php(390): Cm_Cache_Backend_Redis->save('a:46:{s:17:"A_d...', 'e34_AMSHOPBY__C...', Array, 1800)
#5 /var/www/webroot/ROOT/lib/Varien/Cache/Core.php(145): Zend_Cache_Core->save('a:46:{s:17:"A_d...', 'e34_AMSHOPBY__C...', Array, 1800, 8)
#6 /var/www/webroot/ROOT/app/code/core/Mage/Core/Model/Cache.php(403): Varien_Cache_Core->save('a:46:{s:17:"A_d...', 'AMSHOPBY_ CATAL...', Array, 1800)
#7 /var/www/webroot/ROOT/app/code/core/Mage/Core/Model/App.php(1166): Mage_Core_Model_Cache->save('a:46:{s:17:"A_d...', 'amshopby_ catal...', Array, 1800)
#8 /var/www/webroot/ROOT/app/code/core/Mage/Core/Helper/Abstract.php(89): Mage_Core_Model_App->saveCache('a:46:{s:17:"A_d...', 'amshopby_ catal...', Array, 1800)
#9 /var/www/webroot/ROOT/app/code/local/Amasty/Shopby/Helper/Cached.php(45): Mage_Core_Helper_Abstract->_saveCache('a:46:{s:17:"A_d...', 'amshopby_ catal...', Array, 1800)
#10 /var/www/webroot/ROOT/app/code/local/Amasty/Shopby/Helper/Layer/Cache.php(60): Amasty_Shopby_Helper_Cached->save(Array, 'STORE_1_CAT_952...', 1800)
#11 /var/www/webroot/ROOT/app/code/local/Amasty/Shopby/Block/Catalog/Layer/View.php(551): Amasty_Shopby_Helper_Layer_Cache->saveLayerCache()
#12 /var/www/webroot/ROOT/app/code/local/Amasty/Shopby/Block/Catalog/Layer/View.php(460): Amasty_Shopby_Block_Catalog_Layer_View->saveLayerCache()
#13 /var/www/webroot/ROOT/app/code/core/Mage/Core/Block/Abstract.php(930): Amasty_Shopby_Block_Catalog_Layer_View->_afterToHtml('    
toHtml() #15 /var/www/webroot/ROOT/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Text_List->_toHtml() #16 /var/www/webroot/ROOT/app/code/core/Mage/Core/Block/Abstract.php(641): Mage_Core_Block_Abstract->toHtml() #17 /var/www/webroot/ROOT/app/code/core/Mage/Core/Block/Abstract.php(585): Mage_Core_Block_Abstract->_getChildHtml('content', true) #18 /var/www/webroot/ROOT/app/design/frontend/mageguidexp/default/template/page/3columns.phtml(40): Mage_Core_Block_Abstract->getChildHtml('content') #19 /var/www/webroot/ROOT/app/code/local/Mage/Core/Block/Template.php(242): include('/var/www/webroo...') #20 /var/www/webroot/ROOT/app/code/local/Mage/Core/Block/Template.php(274): Mage_Core_Block_Template->fetchView('frontend/magegu...') #21 /var/www/webroot/ROOT/app/code/local/Mage/Core/Block/Template.php(288): Mage_Core_Block_Template->renderView() #22 /var/www/webroot/ROOT/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Template->_toHtml() #23 /var/www/webroot/ROOT/app/code/core/Mage/Core/Model/Layout.php(555): Mage_Core_Block_Abstract->toHtml() #24 /var/www/webroot/ROOT/app/code/core/Mage/Core/Controller/Varien/Action.php(390): Mage_Core_Model_Layout->getOutput() #25 /var/www/webroot/ROOT/app/code/core/Mage/Catalog/controllers/CategoryController.php(161): Mage_Core_Controller_Varien_Action->renderLayout() #26 /var/www/webroot/ROOT/app/code/local/Amasty/Shopby/controllers/CategoryController.php(49): Mage_Catalog_CategoryController->viewAction() #27 /var/www/webroot/ROOT/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Amasty_Shopby_CategoryController->viewAction() #28 /var/www/webroot/ROOT/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('view') #29 /var/www/webroot/ROOT/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http)) #30 /var/www/webroot/ROOT/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch() #31 /var/www/webroot/ROOT/app/Mage.php(683): Mage_Core_Model_App->run(Array) #32 /var/www/webroot/ROOT/index.php(96): Mage::run('', 'store') #33 {main}

Fatal error: Uncaught Exception: Warning: session_write_close(): Failed to write session data using user defined save handler. (session.save_path: ) in /var/www/webroot/ROOT/app/code/local/Mage/Core/Model/Resource/Session.php on line 97 in /var/www/webroot/ROOT/app/code/core/Mage/Core/functions.php:245 Stack trace: #0 [internal function]: mageCoreErrorHandler(2, 'session_write_c...', '/var/www/webroo...', 97, Array) #1 /var/www/webroot/ROOT/app/code/local/Mage/Core/Model/Resource/Session.php(97): session_write_close() #2 [internal function]: Mage_Core_Model_Resource_Session->__destruct() #3 {main} thrown in /var/www/webroot/ROOT/app/code/core/Mage/Core/functions.php on line 245