首先让我提一下，我已经看了很多建议的问题，但没有找到相关的答案。这就是我正在做的。
我连接到Amazon EC2实例。我可以用这个命令登录MySQL根目录:
mysql -u root -p
然后我用host %创建了一个新的用户帐单
CREATE USER 'bill'@'%' IDENTIFIED BY 'passpass';
授予用户bill的所有权限:
grant all privileges on *.* to 'bill'@'%' with grant option;
然后我退出root用户，尝试用bill登录:
mysql -u bill -p
输入正确的密码并得到以下错误:
错误1045(28000):用户“账单”@“localhost”(使用密码:YES)的访问被拒绝
当前回答
sudo -i
mysql -u root
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root';
访问mysql服务不需要登录(可以看到因为在shell mysql>)
其他回答
所以对我来说，这个问题与我映射的端口有关。
3306 => 3306不工作(因为我有一个本地mysql运行)
3307 => 3306工作!
这是在建立ssh隧道的上下文中:
ssh -N -L 3307:rdsDns:3306 ec2User@ec2Dns -i key.pem -v
3307为本端端口，3306为远端端口。
在我的情况下，服务器托管我的代码是发送'@blablabla.amazonaws.com'在用户名的ed时，试图登录MySQL。所以我不得不将%.amazonws.com添加到我的主机的用户配置(dreamhost)中，它通过了
当你的密码包含一些特殊字符，如@，$等，也会发生这种情况。 为了避免这种情况，你可以把password用单引号括起来:
$ mysql -usomeuser -p's0mep@$$w0Rd'
或者在输入时不用密码。请留空，然后在终端要求时输入。这是推荐的方法。
$ mysql -usomeuser -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 191
Server version: 5.5.46-0ubuntu0.14.04.2 (Ubuntu)
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mysql>
I discovered yet another case that appears on the surface to be an edge case; I can export to the file system, via SELECT INTO .. OUTFILE as root, but not as regular user. While this may be a matter of permissions, I've looked at that, and see nothing especially obvious. All I can say is that executing the query as a regular user who has all permissions on the data base in question returns the access denied error that led me to this topic. When I found the transcript of a successful use of SELECT INTO … OUTFILE in an old project, I noticed that I was logged in as root. Sure enough, when I logged in as root, the query ran as expected.
不确定其他人是否会发现这有帮助，但我遇到了同样的错误，并搜索任何匿名用户…但实际上并没有。问题最终是用户帐户被设置为“要求SSL”-这是我在PHPMyAdmin通过进入用户帐户并单击编辑用户的权限发现的。只要我取消了这个选项，一切都按预期工作!
