How do I change NTLMv1 to NTLMv2?
How do I change NTLMv1 to NTLMv2?
Click down to “Local Computer Policy -> Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options. Find the policy “Network Security: LAN Manager authentication level”. Right click on this policy and choose “Properties”. Choose “Send NTLMv2 response only/refuse LM & NTLM”.
Is Windows authentication the same as NTLM?
Applications That Use NTLM NTLM was replaced as the default authentication protocol in Windows 2000 by Kerberos. However, NTLM is still maintained in all Windows systems for compatibility purposes between older clients and servers.
What is the main difference between NTLM and net NTLMv2?
NTLMv2 (A.K.A. Net-NTLMv2) This is the new and improved version of the NTLM protocol, which makes it a bit harder to crack. The concept is the same as NTLMv1, only different algorithm and responses sent to the server.
What does Windows use for authentication?
Windows authentication supports two authentication protocols, Kerberos and NTLM, which are defined in the element. When you install and enable Windows authentication on IIS 7, the default protocol is Kerberos.
Can you relay NTLMv2?
Since MS08-068 you cannot relay a Net-NTLM hash back to the same machine you got it from (e.g. the ‘reflective’ attack) unless you’re performing a cross-protocol relay (which is an entirely different topic). However you can still relay the hash to another machine.
Why does pass the hash work?
Pass-the-Hash (PtH) Attack PtH attacks exploit the authentication protocol, as the passwords hash remains static for every session until the password is rotated. Attackers commonly obtain hashes by scraping a system’s active memory and other techniques.
When to use NTLMv2 in Windows 2008 active or not?
In Group Policy, “Not Defined” = “use the defaults”. So, for this setting, when “Not Defined”, the default of NTLMv2 applies for WS2008R2. Send NTLMv2 response only: Clients use NTLMv2 authentication only and use NTLMv2 session security if the server supports it; domain controllers accept LM, NTLM, and NTLMv2 authentication.
What should the authentication level be for NTLMv2?
To reduce the risk of this issue, we recommend that you configure environments that run Windows NT 4, Windows 2000, Windows XP, and Windows Server 2003 to allow the use of NTLMv2 only. To do this, manually set the LAN Manager Authentication Level to 3 or higher as described here.
Is there a way to remove NTLMv1 from IIS?
If you have an IIS web server configured to do Windows Integrated authentication with non-Windows clients (see problems #7 & 8), an option is to remove Windows Integrated authentication and enable Basic Authentication. If you do, make sure you require HTTPS, so passwords in transit have a secure channel.
How to configure domain default NTLM policies?
To configure domain default NTLM policies of servers joining Windows domain, on Windows Server 2008 or Server 2003: Open ‘Domain Security Policy’ in Administrative Tools of Control Panel Find “Network Security: LAN Manager authentication level”, which is located in Security Settings, Local Policies, Security Options.
