What is the Ntlmssp logon process?

NTLMSSP (NT LAN Manager Security Support Provider) is a security support provider that is available on all versions of DCOM. It uses the Microsoft Windows NT LAN Manager (NTLM) protocol for authentication. The Event ID 540 means the mydomainsername passed the NLM authentication of database server computer.

How do I authenticate with NTLM?

NTLM Authentication Process

1. The user shares their username, password and domain name with the client.
2. The client develops a scrambled version of the password — or hash — and deletes the full password.
3. The client passes a plain text version of the username to the relevant server.

What is authentication package negotiate?

Negotiate is a Microsoft Windows authentication mechanism that uses Kerberos as its underlying authentication provider. When the client tries to access a website that requires Kerberos authentication, the server will return a 401 Unauthorized response, requesting the client to use the Negotiate protocol.

Is Ntlmssp 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 NTLM is generally considered insecure because it uses outdated cryptography that is vulnerable to several modes of attacks.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 is a Type 3 logon?

Logon type 3: Network. A user or computer logged on to this computer from the network. The description of this logon type clearly states that the event logged when somebody accesses a computer from the network. Commonly it appears when connecting to shared resources (shared folders, printers etc.).

How do I know if Windows authentication is working?

On the taskbar, click Start, and then click Control Panel. In Control Panel, click Programs and Features, and then click Turn Windows Features on or off. Expand Internet Information Services, then World Wide Web Services, then Security. Select Windows Authentication, and then click OK.

Where is NTLM authentication 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.

Can I disable NTLM authentication?

To disable outgoing NTLM authentication traffic via Group Policy: Browse to Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options. 4. Set the Network Security: Restrict NTLM: Outgoing NTLM traffic to remote servers setting to Deny All.

How does negotiate authentication work?

Negotiate authentication automatically selects between the Kerberos protocol and NTLM authentication, depending on availability. The Kerberos protocol is used if it is available; otherwise, NTLM is tried. Kerberos authentication significantly improves upon NTLM.

What is the difference between basic authentication and NTLM?

NTLM — Uses an encrypted challenge/response that includes a hash of the password. Basic — Prompts the user for a username and password to authenticate the user against the Windows Active Directory.

How do I know if I have NTLM or Kerberos authentication?

If you’re using Kerberos, then you’ll see the activity in the event log. If you are passing your credentials and you don’t see any Kerberos activity in the event log, then you’re using NTLM. Second way, you can use the klist.exe utility to see your current Kerberos tickets.

What is logon type 4?

Logon type 4: Batch. Batch logon type is used by batch servers, where processes may be executing on behalf of a user without their direct intervention. This event type appears when a scheduled task is about to be started.

What should NTLM authentication look like at the packet?

This contains an encoded string that contains details regarding the User / Domain. If you expand the Proxy-authorization > NTLMSSP, you will see the decoded information sent in the NTLM data. In the “NTLM Message Type”, you will notice that it is “NTLMSSP_NEGOTIATE”.

How does audit event show authentication package as NTLMv1?

The server receives the successful logon and audits that as NTLMv1 as specified by the DC. For logons without extended session security, the server has no option to block the logon request based on the client flags.

Which is the authentication package for Windows NT?

Microsoft does not support manually or programmatically altering the SAM database. Windows uses the LsaLogonUser API for all kinds of user authentications. The LsaLogonUser API authenticates users by calling an authentication package. By default, LsaLogonUser calls the MSV1_0 (MSV) authentication package. This package is included with Windows NT.

How to tell what version of NTLM logon was used?

Package name: If this logon was authenticated via the NTLM protocol (instead of Kerberos for instance) this field tells you which version of NTLM was used. See security option “Network security: LAN Manager authentication level”