Networking LAN Manager Authentication Level

LMCompatibilityLevel, or "Network security: LAN Manager authentication level" as it is called in Group Policy on Windows XP and higher (it is called "LAN Manager authentication level" on Windows 2000), governs the authentication protocols a system is allowed to use and accept. We recommend that it be set to at least 4 or "Send NTLMv2 response only\refuse LM" on all systems. When you do so, you will break access to and from Windows 9x systems as well as some versions of SAMBA.

It is important to recognize that even with LAN Manager authentication level configured to 4, the system will still emit LM and NTLM responses in certain cases; for instance, with programs that use the NTLM Security Support Provider (SSP) directly, such as RPC. To prevent this, you need to configure the "Network security: Minimum session security for NTLM SSP based (including secure RPC) clients/servers" settings. These settings govern the protocols used by the SSP. There are four combinations of settings.


  1. Require message integrity
  2. Require message confidentiality
  3. Require NTLMv2 session security
  4. Require 128-bit encryption

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