メッセージありがとうございます。
最近のエラーは以下の通りです。
このエラーがずっと出っ放しになっています。

[2023-11-02 10:24:54] front.ERROR [N/A] [6501c4e] [anon.] [Eccube\Log\Logger:log:66] - システムエラーが発生しました。 ["An exception occurred in driver: SQLSTATE[HY000] [2002] Connection refused","/var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php",93,"#0 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/doctrine/dbal/lib/Doctrine/DBAL/DBALException.php(169): Doctrine\\DBAL\\Driver\\AbstractMySQLDriver->convertException()\n#1 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/doctrine/dbal/lib/Doctrine/DBAL/DBALException.php(155): Doctrine\\DBAL\\DBALException::wrapException()\n#2 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOMySql/Driver.php(28): Doctrine\\DBAL\\DBALException::driverException()\n#3 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(356): Doctrine\\DBAL\\Driver\\PDOMySql\\Driver->connect()\n#4 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(827): Doctrine\\DBAL\\Connection->connect()\n#5 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/Entity/SingleTablePersister.php(165): Doctrine\\DBAL\\Connection->quote()\n#6 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/Entity/SingleTablePersister.php(140): Doctrine\\ORM\\Persisters\\Entity\\SingleTablePersister->getSelectConditionDiscriminatorValueSQL()\n#7 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/Entity/BasicEntityPersister.php(1063): Doctrine\\ORM\\Persisters\\Entity\\SingleTablePersister->getSelectConditionSQL()\n#8 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/Entity/BasicEntityPersister.php(716): Doctrine\\ORM\\Persisters\\Entity\\BasicEntityPersister->getSelectSQL()\n#9 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/Entity/BasicEntityPersister.php(736): Doctrine\\ORM\\Persisters\\Entity\\BasicEntityPersister->load()\n#10 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/doctrine/orm/lib/Doctrine/ORM/Cache/Persister/Entity/AbstractEntityPersister.php(466): Doctrine\\ORM\\Persisters\\Entity\\BasicEntityPersister->loadById()\n#11 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/doctrine/orm/lib/Doctrine/ORM/EntityManager.php(469): Doctrine\\ORM\\Cache\\Persister\\Entity\\AbstractEntityPersister->loadById()\n#12 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/var/cache/prod/ContainerO2jifqj/EntityManager_9a5be93.php(88): Doctrine\\ORM\\EntityManager->find()\n#13 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/doctrine/orm/lib/Doctrine/ORM/EntityRepository.php(151): EntityManager_9a5be93->find()\n#14 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/src/Eccube/Repository/BaseInfoRepository.php(44): Doctrine\\ORM\\EntityRepository->find()\n#15 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/src/Eccube/EventListener/TwigInitializeListener.php(162): Eccube\\Repository\\BaseInfoRepository->get()\n#16 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/symfony/event-dispatcher/EventDispatcher.php(214): Eccube\\EventListener\\TwigInitializeListener->onKernelRequest()\n#17 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/symfony/event-dispatcher/EventDispatcher.php(44): Symfony\\Component\\EventDispatcher\\EventDispatcher->doDispatch()\n#18 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/symfony/http-kernel/HttpKernel.php(127): Symfony\\Component\\EventDispatcher\\EventDispatcher->dispatch()\n#19 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/symfony/http-kernel/HttpKernel.php(68): Symfony\\Component\\HttpKernel\\HttpKernel->handleRaw()\n#20 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/vendor/symfony/http-kernel/Kernel.php(200): Symfony\\Component\\HttpKernel\\HttpKernel->handle()\n#21 /var/www/vhosts/gdefence.com/httpdocs/cp-bin/eccube4/index.php(76): Symfony\\Component\\HttpKernel\\Kernel->handle()\n#22 {main}"] [GET, /cp-bin/eccube4/products/detail/485, 66.249.79.132, NULL, Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)]
[2023-11-02 10:24:54] front.INFO [N/A] [6501c4e] [anon.] [Eccube\Log\Logger:log:66] - PROCESS END ["product_detail"] [GET, /cp-bin/eccube4/products/detail/485, 66.249.79.132, NULL, Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)]
[2023-11-02 10:24:54] front.DEBUG [N/A] [6501c4e] [anon.] [Eccube\Log\Logger:log:66] - Transaction is not active. Rollback skipped. [] [GET, /cp-bin/eccube4/products/detail/485, 66.249.79.132, NULL, Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)]
[2023-11-02 10:25:06] front.INFO [N/A] [00094e5] [N/A] [Eccube\Log\Logger:log:66] - INIT [] [GET, /cp-bin/eccube4/, 94.23.203.180, NULL, Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)]
[2023-11-02 10:25:06] request.INFO [N/A] [00094e5] [N/A] [Symfony\Component\HttpKernel\EventListener\RouterListener:onKernelRequest:123] - Matched route "homepage". {"route":"homepage","route_parameters":{"_controller":"Eccube\\Controller\\TopController::index","_route":"homepage"},"request_uri":"https://www.gdefence.com/cp-bin/eccube4/","method":"GET"} [GET, /cp-bin/eccube4/, 94.23.203.180, NULL, Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)]
[2023-11-02 10:25:06] security.INFO [N/A] [00094e5] [anon.] [Symfony\Component\Security\Http\Firewall\AnonymousAuthenticationListener:handle:60] - Populated the TokenStorage with an anonymous Token. [] [GET, /cp-bin/eccube4/, 94.23.203.180, NULL, Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)]
[2023-11-02 10:25:06] front.INFO [N/A] [00094e5] [anon.] [Eccube\Log\Logger:log:66] - PROCESS START ["homepage"] [GET, /cp-bin/eccube4/, 94.23.203.180, NULL, Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)]