Linux users encountered an error message when changing their passwords:

[monitor@monitor1 etc]$ passwd
Changing password for user monitor.
Changing password for monitor
(current) UNIX password:
You must wait longer to change your password
passwd: Authentication token manipulation error
Linux Version: Red Hat EnterpriseLinux Server Release 5.7 (Tikanga)

Fix: Linux has a limit on the amount of time you can change your password again. If the number of days is 5, the user in Linux cannot change his password for 5 days. You can change this setting in the /etc/shadow file: the fourth field is the number of days it will take to change the password again.