Unauthenticated RPC clients must be restricted from connecting to the RPC server.

From Windows 8 Security Technical Implementation Guide

Part of RPC - Unauthenticated RPC Clients

Associated with IA controls: ECSC-1

SV-48207r1_rule Unauthenticated RPC clients must be restricted from connecting to the RPC server.

Vulnerability discussion

Configuring RPC to restrict unauthenticated RPC clients from connecting to the RPC server will prevent anonymous connections.

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Configure the policy value for Computer Configuration -> Administrative Templates -> System -> Remote Procedure Call -> "Restrict Unauthenticated RPC clients" to "Enabled" and "Authenticated".

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