ypserv does not take newly changed password

A colleague setup an NIS server to centralize the authentication, but on client side, after using yppasswd changed password, it never takes effect (i.e. still have to use old password), but restart ypserv make data sync up.

Quickly google and found this article, then adding “host 127.0.0.1” to /var/yp/securenets then restart (for the last time) ypserv gets this solved.