When I try to change a NIS password, the first time all goes right. Before the password change, the YPPASSWD service stops, resulting in an RPC's Unable to receive error. I've managed to partially solution this problem editing the /etc/rc.d/init.d/yppasswd script and creating another script that calls the previous script after the yppasswd command.
*** This bug has been marked as a duplicate of 3126 ***