以 root 身份成功登录 MySQL 5.6 后，提示拒绝 root 访问，错误 1045 (28000)

Question

我最近使用 MacPorts 将 MySQL 5.5 升级到 5.6。我可以在我的笔记本电脑上正常使用我的数据库。我尝试启用对数据库的远程访问，以便我可以使用网络上其他计算机上的 DB 客户端编辑数据库，但我以 root 身份登录后，系统显示拒绝 root 访问：

$ mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 31
Server version: 5.6.19 Source distribution

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mysql> GRANT ALL PRIVILEGES ON *.* TO 'username'@'%' IDENTIFIED BY 'password' WITH GRANT OPTION;
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

我已经尝试过发布的答案mysql 如何修复用户“root”@“localhost”的访问被拒绝但它并没有解决问题