This security setting allows a client to require the negotiation of 128-bit encryption and/or NTLMv2 session security. These values are dependent on the LAN Manager Authentication Level security setting value. The options are: Require NTLMv2 session security: The connection will fail if NTLMv2 protocol is not negotiated. Require 128-bit encryption: The connection will fail if strong encryption (128-bit) is not negotiated. Default: Windows XP, Windows Vista, Windows 2000 Server, Windows Server 2003, and Windows Server 2008: No requirements. Windows 7 and Windows Server 2008 R2: Require 128-bit encryption Fix: (1) GPO: Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\Network security: Minimum session security for NTLM SSP based (including secure RPC) clients (2) REG: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0!NTLMMinClientSec