I have redhat enterprise linux version 5 with many user accounts , many of them login from internet , like ftp i want them login to the server through ssh and they are able to do so but when they try to change their password it is not happening , please tell me how to set this option for them so that they can change their password , as of now when they try following is the error message:
Changing password for user mt.
Changing password for mt
(current) UNIX password:
passwd: Authentication token manipulation error
please help me to set this.