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RPC services can run on any port on the system. When a client attempts to access an RPC service on a server, it must find out which port that service is running on. It does this by querying the portmapper process on the well-known port of 111. It sends the RPC program number of the service, and gets back the port number. From this point on, the client program will send its RPC queries to that new port.
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