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If there is no ypserv(1Mnis) daemon running on the master, you can no longer update any of the NIS maps. If there is no ypserv daemon running on the master, but clients have ypbind running, machines may hang indefinitely until they find a ypserv.
To turn off NIS services safely, make sure all the clients stop running ypbind before you disable ypserv on the master and slave servers. Also, make sure any local administrative files that will be needed once the NIS maps are no longer available (for example, /etc/passwd) are set up on each client, slave or master machine before you turn off NIS.