message from server: "Host '192.168.55.122' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'"

根据引用，错误信息"Host '192.168.55.122' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'"是由于该IP地址在连接数据库时出现了多个连接错误，导致被阻塞。这可能是由于短时间内产生了太多中断的数据库连接，超过了MySQL数据库的max_connection_errors设置。解决此问题的方法如下：

1. 提高允许的max_connection_errors数量：可以通过命令"show variables like '%max_connection_errors%'"查看当前的max_connection_errors值，默认为10。您可以使用命令"set global max_connect_errors = 1000;"将max_connection_errors的数量修改为1000（立即生效），或者在my.cnf配置文件中的部分添加"max_connect_errors = 1000"（重启MySQL后生效）。

2. 重置错误记录数：可以使用命令"mysql> flush hosts;"来重置错误记录数。这将清除被阻塞的IP地址的连接错误记录，使其能够重新连接到MySQL数据库。

请注意，以上方法只是治标不治本，首先需要找到导致连接错误的原因，并进行修复，以避免继续产生连接错误。<em>1</em><em>2</em><em>3</em>
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