Does Outlook use NTLM?
Outlook attempts to authenticate using NTLM only. If you disable or do not configure this policy setting, Outlook will attempt to authenticate using the Kerberos authentication protocol. If it cannot (because no Windows 2000 or later domain controllers are available), it will authenticate using NTLM.
What is the difference between NTLM and basic authentication?
NT LAN Manager (NTLM) authentication is a challenge-response scheme that is a securer variation of Digest authentication. NTLM uses Windows credentials to transform the challenge data instead of the unencoded user name and password. NTLM authentication requires multiple exchanges between the client and server.
Does exchange use NTLM?
NTLM authentication is only available for Exchange on-premises servers. For applications that run inside the corporate firewall, integration between NTLM authentication and the . NET Framework provides a built-in means to authenticate your application. Works “out of the box” with your Exchange server.
Should NTLM be used?
Current applications NTLM authentication is still supported and must be used for Windows authentication with systems configured as a member of a workgroup. NTLM authentication is also used for local logon authentication on non-domain controllers.
How do I know if NTLM is enabled?
To find applications that use NTLMv1, enable Logon Success Auditing on the domain controller, and then look for Success auditing Event 4624, which contains information about the version of NTLM.
Do I have NTLM enabled?
In the Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options section, find and enable the Network Security: Restrict NTLM: Audit NTLM authentication in this domain policy and set its value to Enable all.
What is the impact of disabling NTLM?
If you want to turn off NTLM audit policy settings, there will be a little impacts, that is when NTLM authentication is successful or failed, no audit events will logged in Security log under Event Viewer on any DC.
Does exchange use NTLM or Kerberos?
Note: Exchange Server supports the Kerberos authentication protocol and NTLM for authentication. The Kerberos protocol is the more secure authentication method and is supported on Windows 2000 Server and later versions. NTLM authentication is supported in pre-Windows 2000 environments.
Is it OK to disable NTLM?
Windows 2000 Microsoft introduced a more secure Kerberos authentication protocol. The NTLM (generally, it is NTLMv2) is still widely in use for authentication on Windows domain networks. We recommend disabling NTLMv1 and NTLMv2 protocols and use Kerberos due to the following reasons: NTLM has very weak encryption.
Does Outlook use Kerberos authentication?
Outlook 2016 for Mac supports Kerberos protocol as a method of authentication with Microsoft Exchange Server and standalone LDAP accounts. Kerberos protocol uses cryptography to help provide secure mutual authentication for a network connection between a client and a server, or between two servers.
Should you disable NTLM authentication?
There can be multiple reasons why you may want to disable NTML Authentication in Windows Domain. Some of the most common reasons are: NTML is not secure and offers weak encryption. In the case of NTML, your password hash will be stored in LSA Service.
Does exchange use Kerberos authentication?
The Microsoft Exchange Service Host service that runs on the Client Access server (CAS) role is extended in Exchange Server 2010 SP1 to use a shared alternate service account (ASA) credential for Kerberos authentication. This service host extension monitors the local computer.
Does Office 365 use NTLM?
Office 365 does not support NTLM authentication, so Office 365 admins should use our integrated OAuth app instead.