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

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

If the following registry value does not exist or is not configured as specified, this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SOFTWARE\Policies\Microsoft\Windows NT\Rpc\

Value Name: RestrictRemoteClients

Value Type: REG_DWORD Value: 1

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