Windows Server 2025 must restrict unauthenticated Remote Procedure Call (RPC) clients from connecting to the RPC server on domain-joined member servers and stand-alone or nondomain-joined systems.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-278180 | WN25-MS-000040 | SV-278180r1182286_rule | CCI-001967 | medium |
| Description | ||||
| Unauthenticated RPC clients may allow anonymous access to sensitive information. Configuring RPC to restrict unauthenticated RPC clients from connecting to the RPC server will prevent anonymous connections. | ||||
| STIG | Date | |||
| Microsoft Windows Server 2025 Security Technical Implementation Guide | 2026-02-20 | |||
Details
Check Text (C-278180r1182286_chk)
This applies to member servers and stand-alone or nondomain-joined systems, it is not applicable for domain controllers.
If the following registry value does not exist or is not configured as specified, this is a finding:
Registry HiveHKEY_LOCAL_MACHINE
Registry Path\SOFTWARE\Policies\Microsoft\Windows NT\Rpc\
Value NameRestrictRemoteClients
TypeREG_DWORD
Value0x00000001 (1)
Fix Text (F-82615r1181245_fix)
Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Remote Procedure Call >> Restrict Unauthenticated RPC clients to "Enabled" with "Authenticated" selected.