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.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-278180 | SRG-OS-000379-GPOS-00164 | WN25-MS-000040 | SV-278180r1182286_rule | 2026-02-20 | 1 |
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.
ℹ️ Check
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
Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Remote Procedure Call >> Restrict Unauthenticated RPC clients to "Enabled" with "Authenticated" selected.