我正在运行基于 Ubuntu 的 LEMP 邮件/Web 服务器，使用 MariaDB。当我运行命令时
sudo service mariadb status
我收到以下警告：
Oct 24 00:32:44 mail.example.com mariadbd[1226]: 2022-10-24 0:32:44 7610 [Warning] Aborted connection 7610 to db: 'unconnected' user: 'unauthenticated' host: '127.0.0.1' (This connection closed normally without authentication)
Oct 24 00:32:44 mail.example.com mariadbd[1226]: 2022-10-24 0:32:44 7611 [Warning] Aborted connection 7611 to db: 'unconnected' user: 'unauthenticated' host: '127.0.0.1' (This connection closed normally without authentication)
Oct 24 00:32:44 mail.example.com mariadbd[1226]: 2022-10-24 0:32:44 7612 [Warning] Access denied for user 'root'@'localhost'
Oct 24 00:32:44 mail.example.com mariadbd[1226]: 2022-10-24 0:32:44 7613 [Warning] Aborted connection 7613 to db: 'unconnected' user: 'unauthenticated' host: '127.0.0.1' (This connection closed normally without authentication)
Oct 24 00:32:44 mail.example.com mariadbd[1226]: 2022-10-24 0:32:44 7614 [Warning] Aborted connection 7614 to db: 'unconnected' user: 'unauthenticated' host: '127.0.0.1' (This connection closed normally without authentication)
Oct 24 00:32:44 mail.example.com mariadbd[1226]: 2022-10-24 0:32:44 7615 [Warning] Aborted connection 7615 to db: 'unconnected' user: 'unauthenticated' host: '127.0.0.1' (This connection closed normally without authentication)
Oct 24 00:32:44 mail.example.com mariadbd[1226]: 2022-10-24 0:32:44 7616 [Warning] Aborted connection 7616 to db: 'unconnected' user: 'unauthenticated' host: '127.0.0.1' (This connection closed normally without authentication)
有人能解释一下这里到底发生了什么、如何调试以及如何修复这些警告吗？这是安全问题还是功能问题？任何详细说明、解释和解决方案都将不胜感激。