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背景

前几天在对项目做数据源切换时，发现切换完数据源后项目无法启动，一直报如下异常：

### Error querying database.  Cause: ERR-CODE: [TDDL-4102][ERR_ATOM_GET_CONNECTION_FAILED_KNOWN_REASON] Get connection for db '*********' failed because Communications link failure
the last packet successfully received from the server was 2 milliseconds ago.  The last packet sent successfully to the server was 2 milliseconds ago.. 
### The error may exist in file [/Users/eleme/IdeaProjects/kbtdatadistribute/kbtdatadistribute-dal/target/classes/mybatis/mapper/data/FsDataSourceMapper.xml]
Caused by: com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 5005, active 0, maxActive 10
 at com.alibaba.druid.pool.DruidDataSource.getConnectionInternal(DruidDataSource.java:1221)
 at com.alibaba.druid.pool.DruidDataSource.getConnectionDirect(DruidDataSource.java:1045)
 at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainIm

本文标签： 解决办法异常disabledprotocolcipher

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