Lost connection to MySQL server during query (MySQL error code: 2013, SQLState: HY000 )

SHOW VARIABLES LIKE 'wait_timeout';
SET SESSION wait_timeout = 999999;

SHOW variables LIKE 'NET_read_timeout';
SET SESSION   net_read_timeout = 1000;

SHOW VARIABLES LIKE 'connect_timeout';
SET GLOBAL   connect_timeout = 600;

2.