[CentOS] cannot rewrite shadow password file

Dear Michel,

> Whatś the output of :
> getenforce
>   
Enforcing

> ls -Z /etc/shadow 
>   
-r--------  root     root     system_u:object_r:shadow_t       /etc/shadow

After running those commands, I can run passwd without errors (passwd: 
all authentication tokens updated successfully), but the password won't 
be changed.

> might be an SELinux issue
> If so, you can do a "restorecon /etc/shadow"
>   
Did it, still can't update the password.

Regards
Samuel