To run any of the software mentioned below you will need to run
the program /sbin/portmap. Some Linux distributions already have
the code in the /sbin/init.d/ or /etc/rc.d/ files to start up this
daemon. All you have to do is to activate it and reboot your Linux
machine. Read your Linux Distribution Documentation how to do
The RPC portmapper (portmap(8)) is a server that converts RPC
program numbers into TCP/IP (or UDP/IP) protocol port numbers. It
must be running in order to make RPC calls (which is what the
NIS/NIS+ client software does) to RPC servers (like a NIS or NIS+
server) on that machine. When an RPC server is started, it will
tell portmap what port number it is listening to, and what RPC
program numbers it is prepared to serve. When a client wishes to
make an RPC call to a given program number, it will first contact
portmap on the server machine to determine the port number where
RPC packets should be sent.
Since RPC servers could be started by inetd(8), portmap should
be running before inetd is started.
For secure RPC, the portmapper needs the Time service. Make
sure, that the Time service is enabled in /etc/inetd.conf on all
# Time service is used for clock syncronization.
time stream tcp nowait root internal
time dgram udp wait root internal
IMPORTANT: Don't forget to restart inetd after changes on its
configuration file !