The server for NIS version 2, formerly knows as YP, is not supported in SunOS anymore. It has been replaced by NIS+, the new version of the Network Information Service, see nis+(1) . This release only supports the client functionality of NIS, see ypclnt(3N) . The client functions are either supported by the ypserv process running on a machine with an earlier version of SunOS or by the NIS+ server in "YP-compatibility" mode, see rpc.nisd(1M) . See ypfiles(4) for more details.