- manipulation token error

[Paolo De Michele <paolo@xxxxxxxxxxxxxxxxx>]

hi all,

I can't change root password because in my VPS the ssh console gives me:

$ ssh -p xxxx2 username@ipaddress
username@ipaddress's password: 
Last login: Thu Jan  9 11:46:58 2014 from dynamic-adsl-xxx.xxx.xx.it
WARNING: Your password has expired.
You must change your password now and login again!
Changing password for username.
(current) UNIX password: 
passwd: Authentication token manipulation error
passwd: password unchanged
Connection to xxxxxx closed.

how I fix this problem?
thanks in advance

regards
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