When users in an NIS domain change their passwords, the NIS client consults its local algorithms configuration in the /etc/security/policy.conf file. The NIS client machine encrypts the password.
Specify the password encryption algorithm in the /etc/security/policy.conf file on the NIS client.
Copy the modified /etc/security/policy.conf file to every client machine in the NIS domain.
To minimize confusion, copy the modified /etc/security/policy.conf file to the NIS root server and to the slave servers.