NIS users can't change own password

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http://www.linuxquestions.org – Hi , Im using Redhat EL 6,when nis user try to change own password with their account in both server and client "Its saying you cannot reuse the old password". when login as root user in both client and server system , able to change the nis user password without any issues. i checked in NIS server yppasswdd is running and able to get the result for ypmatch nisuser passwd. Im using /etc/passwd file for building the NIS datbase. NOTE: i disabled firewall and selinux. Kindly help me to solve the issue. Thanks Vinoth (HowTos)