以前正常使用的GataGrip，突然在某天报下面的错误提示:08S01

[08S01]
    Communications link failure

    The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
No appropriate protocol (protocol is disabled or cipher suites are inappropriate).

从提示的英文能看出来，是 protocol的问题，打开数据库连接设置：
DataGrip连接Mysql报08S01解决方案-小白菜博客
将useSsl设置为false，完美解决。