java.sql.SQLException: null, message from server: "Host '119.40.72.61' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'"

```
2022-09-19 10:07:50,777 ERROR [Druid-ConnectionPool-Create-1969370971] com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run (DruidDataSource.java : 2803) create connection SQLException, url: jdbc:mysql://119.3.136.251:3306/rblc?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8, errorCode 1129, state HY000
java.sql.SQLException: null,  message from server: "Host '119.40.72.61' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'"
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:829)
	at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:449)
	at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:242)
	at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:198)
	at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:156)
	at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:227)
	at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:150)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1659)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1723)
	at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2801)

```

学习教程/SpringCloud-multiple-gradle

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