How did I fix «Host '<…>' is not allowed to connect to this MySQL server»?

MySQL
1

01

2

Step 1

bind-address = *

dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_bind_address

Step 2

GRANT ALL ON *.* to root@'%' IDENTIFIED BY '<password>';
FLUSH PRIVILEGES;