can not change root password from root
I am using CentOS 6.3. I cann't change root password.
Changing password for user root.
Retype new password:
passwd: Authentication token manipulation error
1) You have tried several times I hope?
If not, just try again - maybe ther was a mismatch between your two passwords.
2) How about password requirements?
AFAIK that is most commonly set with PAM.
Check under /etc/pam.d/ (or whatever GUI-tool there might be for this).
3) Are all accounts local, or do you use an authentication system (AD, LDAP etc)?
I have tried several times , there's no mismatch with password. Only one local account here .
Is the root filesystem mounted in read only mode by any chance?
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