Host 'TAN-IT' is not allowed to connect to this MySQL server" code example

Example 1: host 127.0 0.1 is not allowed to connect to this mysql server

UPDATE mysql.user SET host='%' WHERE user='root';

Example 2: host not allowed to connect to this mysql server

mysql -u root -p
    -- root password

    CREATE USER 'username'@'localhost' IDENTIFIED BY 'password';

    GRANT ALL PRIVILEGES ON *.* TO 'username'@'localhost' WITH GRANT OPTION;

    CREATE USER 'username'@'%' IDENTIFIED BY 'password';

    GRANT ALL PRIVILEGES ON *.* TO 'username'@'%' WITH GRANT OPTION;

    FLUSH PRIVILEGES;

    EXIT;