Mandate the maximum version of SMB

Supported on: At least Windows Server 2025, Windows 11

Registry

HKLM Software\Policies\Microsoft\Windows\LanmanWorkstation

Options

MaxSmb2Dialect enum
  • SMB 3.1.1 -> 785
  • SMB 3.0.2 -> 770
  • SMB 3.0.0 -> 768
  • SMB 2.1.0 -> 528
  • SMB 2.0.2 -> 514

Description

This policy controls the maximum version of SMB protocol Note: This group policy does not prevent use of SMB 1 if that component is still installed and enabled.