Changing nis password

This is a RHEL3 box which is the NIS master for a domain. Since my
account is in the nis maps, I thought to change its password, I would do:

[mauricio@moss ~]$ yppasswd
Changing NIS account information for mauricio on localhost.localdomain.
Please enter old password:
Changing NIS password for mauricio on localhost.localdomain.
Please enter new password:
The password must have at least 6 characters.
Please enter new password:
Please retype new password:
Error while changing the NIS password.
The NIS password has not been changed on localhost.localdomain.

[mauricio@moss ~]$

First of all, how can I get it to tell me what went wrong? Second, why
does it says I am changing the password in localhost.localdomain as
opposite to in my yp domain?

--
Mauricio raub-kudria-com
(if you need to email me, use this address =)