One common practice is to deny the user any indication that the user name is valid but that the password is incorrect.
一种常见的做法是不要向用户提示用户名有效、只有密码不正确。
The User name or old password is incorrect. Letters in passwords must be typed using the correct case.
用户名或旧密码不正确。密码的字母必须使用正确的大小写。
On screen showed: your user name is unknown or your password is incorrect!
屏幕显示：用户名不存在或密码不对！
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