The password must not contain any whitespaces, Unicode characters, or the combination of "." and "@", when "." is placed before "@".
To see the characters that you entered, click and hold the Show button.
The number of attempts for entering the password is limited. By default, the maximum number of allowed password entry attempts is 10. You can change the allowed number of attempts to enter a password, as described in "Changing the number of allowed password entry attempts".
If the user enters an invalid password the specified number of times, the user account is blocked for one hour. You can unblock the user account only by changing the password.