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报错Internal Server Error CDbConnection failed to open the DB connection. An internal error occurred while the Web server was processing your request. Please contact the webmaster to report this problem. Thank you. 之前是阿里的负载均衡服务，目前停止负载均衡服务后，提示该错误

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Web应用防火墙（WAF）

适用于网站、H5、小程序等。全面应对被搜索引擎标识为危险；出现垃圾内容、恶意弹窗；域名劫持；Web应用漏洞；被挂马中毒；数据泄露；恶意注册灌水；被CC攻击导致Web应用崩溃或打不开；SQL注入、XSS跨站等攻击；爬虫等问题

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