# grep -r max_connect_errors /usr/local/src/mysql-5.6.25/ > tmp
# grep -v mysql-test tmp 
/usr/local/src/mysql-5.6.25/INSTALL-SOURCE:   max_connect_errors 10 100
/usr/local/src/mysql-5.6.25/sql/mysqld.cc:ulong max_connections, max_connect_errors;
/usr/local/src/mysql-5.6.25/sql/mysqld.h:extern ulong max_connect_errors, connect_timeout;
/usr/local/src/mysql-5.6.25/sql/sys_vars.cc:static Sys_var_ulong Sys_max_connect_errors(
/usr/local/src/mysql-5.6.25/sql/sys_vars.cc:       "max_connect_errors",
/usr/local/src/mysql-5.6.25/sql/sys_vars.cc:       GLOBAL_VAR(max_connect_errors), CMD_LINE(REQUIRED_ARG),
/usr/local/src/mysql-5.6.25/sql/hostname.cc:      if (entry->m_errors.m_connect >= max_connect_errors)