What is NTLMSSP used for?
NTLMSSP (NT LAN Manager (NTLM) Security Support Provider) is a binary messaging protocol used by the Microsoft Security Support Provider Interface (SSPI) to facilitate NTLM challenge-response authentication and to negotiate integrity and confidentiality options.
What is NTLMSSP process?
Note: NTLMSSP is an authentication method that is an enhanced version of NTLMv1 or NTLMv2 and can actually wrapper those protocols. In the Negotiate, it allows the client and server to agree on the authentication to be used.
Should I disable NTLM authentication?
To disable NTLM within the domain, the setting NTLM authentication in this domain is set to the value Deny all. The NTLM authentication request of the web server will be blocked on the DC (Event ID 4004)….Example.
| Hostname | Setting | Value |
|---|---|---|
| client01 | Add remote server exceptions for NTLM authentication | 192.168.1.112 |
Do I need NTLM?
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.
What happens if I disable NTLM?
The main risk of disabling NTLM is the potential usage of legacy or incorrectly configured applications that can still use NTLM authentication. In this case, you will have to update or configure them in a special way to switch to Kerberos.
What is the difference between Kerberos and NTLM?
Kerberos is an open source software and offers free services. NTLM is the proprietary Microsoft authentication protocol. 2. Kerberos supports delegation of authentication in multi-tier application.
Is NTLM enabled by default?
NT LAN Manager (including LM, NTLM v1, v2, and NTLM2) is enabled and active in Server 2016 by default, as its still used for local logon (on non-domain controllers) and workgroup logon authentication in Server 2016. You can restrict and/or disable NTLM authentication via Group Policy.
Is NTLM secure?
Is NTLM secure? NTLM is generally considered insecure because it uses outdated cryptography that is vulnerable to several modes of attacks. NTLM is also vulnerable to the pass-the-hash attack and brute-force attacks.
What still uses NTLM authentication?
Current applications NTLM authentication is also used for local logon authentication on non-domain controllers. Kerberos version 5 authentication is the preferred authentication method for Active Directory environments, but a non-Microsoft or Microsoft application might still use NTLM.
How do I know if I have NTLM?
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.