rpc.nispasswdd daemon is an ONC+ RPC service that services password update requests from nispasswd(1) and yppasswd(1). It updates password entries in the NIS+ passwd table.
rpc.nispasswdd is normally started from a system startup script after the NIS+ server (rpc.nisd(1M)) has been started. rpc.nispasswdd will determine
whether it is running on a machine that is a master server for one or more NIS+ directories. If it discovers that the host is not a master server, then it will promptly exit. It will also determine if rpc.nisd(1M) is running in NIS (YP) compatibility mode (the -Yoption) and will register as yppasswdd for NIS (YP) clients as well.
rpc.nispasswdd will syslog all failed password update attempts, which will allow an administrator to determine whether someone was trying to "crack" the passwords.
rpc.nispasswdd has to be run by a superuser.