To remove NIS+ from a client machine that was set up as an NIS+ client using the nisclient -i script as described in Solaris Naming Setup and Configuration Guide, simply run nisclient with the -r option:
client# nisclient -r |
nisclient -r simply undoes the most recent iteration of nisclient -i; it restores the previous naming system used by the client, such as NIS or /etc files.