我已经在谷歌云中安装了bitnami-opencart一切正常但是在实施SSL之后。我的网站关闭，它显示以下错误。
Warning: mysqli::__construct(): (HY000/2002): Connection refused in /opt/bitnami/apps/opencart/htdocs/system/library/db/mysqli.php on line 8
Warning: DB\MySQLi::__construct(): Couldn't fetch mysqli in /opt/bitnami/apps/opencart/htdocs/system/library/db/mysqli.php on line 11
Warning: DB\MySQLi::__construct(): Couldn't fetch mysqli in /opt/bitnami/apps/opencart/htdocs/system/library/db/mysqli.php on line 11