Lan manager authentication level windows 7 default

Even if you use NTLMv2 for client computers and servers running these early versions of the Windows operating system, Windows-based client computers and servers that are members of the domain use the Kerberos protocol to authenticate with Windows Server domain controllers.

Microsoft and a number of independent organizations strongly recommend this level of authentication when all client computers support NTLMv2. Windows NT 4. For information about a hotfix to ensure that this setting works in networks that include Windows NT 4. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Bloombase Knowledgebase Search:. Application Notes. Request for Enhancements RFE. Release Notes.

Most viewed. What does Bloombase Security Infrastructure do? What encryption standards does Bloombase StoreSafe adopt? Is this page helpful? Please rate your experience Yes No. Any additional feedback? Submit and view feedback for This product This page. View all page feedback. In this article. To control how a workstation or member server will handle NTLM when authenticating local SAM accounts or — more often — when functioning as an NTLM client, configure this setting in an applicable group policy object that is applied to the desired computers.

Session keys are not used during the actual authentication sequence, but when an application requests security by calling the EncryptMessage or SignMessage APIs. NTLMv2 Session Security protects against certain man-in-the-middle attacks by improving how the session key is generated. Set this value to level 3 or higher unless you must support pre-Windows or non Windows computers. Since both levels only attempt to negotiate NTLMv2 session security, a man-in-the-middle attacker can force the systems to fall back to older versions of the protocol.

Therefore only level 3 and above ensures the benefits of session security.