322756 How to back up and restore the registry in Windows. Open the Windows Settings and search Internet Options. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: Windows NT also supports the NTLM session security mechanism that provides for message confidentiality (encryption) and integrity (signing). How to enable Network Level Authentication for RDP? Click the Version tab. You cannot configure it, for example, to use NTLM v2 to connect to Windows 2000-based servers and then to use NTLM to connect to other servers. Client devices use NTLMv2 authentication, and they use NTLMv2 session security if the server supports it. However, an organization may still have servers that use NTLM. You must configure domain controllers only to disable support for NTLM 1 or LM authentication. - how to enable Kerberos authentication on Windows 10 to be able to connect to a server in another Domain using credentials of this domain? In Active Directory domains, the Kerberos protocol is the default authentication protocol. - why the NTLS is used connecting from Windows 10 and Kerberos from WS 2016 (not from all servers, but from PAW only)? 1.2. To enable a Windows 95, Windows 98, or Windows 98 Second Edition client for NTLM 2 authentication, install the Directory Services Client. To enable NTLM authentication you will need to customise your Firefox settings. Client devices use NTLMv1 authentication, and they use NTLMv2 session security if the server supports it. When NTLM auditing is enabled and Windows event 8004 are logged, Azure ATP sensors now automatically read the event and enrich your NTLM authentications activities display with the accessed server data. NTLM authentication failures when there is a time difference between the client and DC or workgroup server. You operate a web server or other services (such as Exchange Client Access Role, Sharepoint [yuk! Clients use NTLM authentication, and use NTLM 2 session security if the server supports it; domain controllers refuse LM authentication (that is, they accept NTLM and NTLM 2). However, I am unable to connect to Windows Servers that have restricted their connections to only those using NLA. In IE under Options --Advanced there is the option to Enable Integrated Windows Authentication. Source: Microsoft-Windows-NTLM Date: 9/25/2009 10:47:36 AM Event ID: 8001 Task Category: Auditing NTLM Level: Information Keywords: User: SYSTEM … Domain controllers refuse to accept LM and NTLM authentication, and they will accept only NTLMv2 authentication. Historically, Windows NT supports two variants of challenge/response authentication for network logons: Recent improvements in computer hardware and software algorithms have made these protocols vulnerable to widely published attacks for obtaining user passwords. If you use 0x00080000 for the NtlmMinClientSec value, the connection does not succeed if NTLM 2 session security is not negotiated. Use Windows Explorer to locate the Secur32.dll file in the %SystemRoot%\System folder. It does not affect interactive logons. To use the local security settings to force Windows to use NTLMv2: 1. Data Type: REG_DWORD No domain controller configuration is required to support NTLM 2. By Default, Windows authentication value is false in “applicationhost.config” Now, we have successfully enabled Windows authentication in WebAPI Project. Create an LSA registry key in the registry key listed above. 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. Disable: the policy is disabled (NTLM authentication is allowed in the domain) b. This app isn't formally supported. We can use the Network Security: Restrict NTLM: NTLM authentication in this domain policy. From the Control Panel: Navigate to the Control Panel. clicks the "Login using NT domain account" link on the login page), and in the usual case an unauthenticated user will be simply redirected to the TeamCity login page.The TeamCity server forces NTLM HTTP authentication only for Windows users by default. by miniOrange for Jira Server 7.0.0 - 8.14.1. You can use Windows authentication when your IIS 7 server runs on a corporate network that is using Microsoft Active Directory service domain identities or other Windows accounts to identify users. Click Local intranet > Sites. If you open Internet Explorer (yes, it still exists inside windows 10), you can enable advanced windows authentication in the internet options and then the changes should also apply to Microsoft Edge. However, if the Kerberos protocol is not negotiated for some reason, Active Directory uses LM, NTLM, or NTLM version 2 (NTLMv2). Based on my research, In terms of the event 100: NTLM authentication failed because the account was a member of the Protected User group, “Accounts that are members of the Protected Users group that authenticate to a Windows Server 2012 R2 domain are unable to: Authenticate with NTLM authentication.” "If the domain functional level is Windows Server 2012 R2, members of the group can … 2871774 New event log entries that track NTLM authentication delays and failures in Windows Server 2008 SP2 are available For more information about a similar issue that occurs in Windows Server 2003, click the following article number to view the article in … (The domain controllers can run Windows NT 4.0 Service Pack 6 if the client and server are joined to different domains.) Trying to connect to Samba shares on a Linux host with a Windows 10 client, even after setting the client Security Policy to allow non-NTLMv2 authentication, the client still gives errors like "The specified password is not correct. Value Name: NtlmMinClientSec You may have devices (NASs) on your network that you can no longer can connect to or you may not be able to network to an older OS. For additional information about installing the appropriate Active Directory Client Extension, click the following article number to view the article in the Microsoft Knowledge Base: 288358 How to install the Active Directory client extension. I have not done anything related to NLA for my Windows 10 Professional. To verify your installation version: Use Windows Explorer to locate the Secur32.dll file in the %SystemRoot%\System folder. To access the website or service (herein referred to as a service) the user needs to be authenticated with their Windows [Active Directory Domain] credentials 3. Hi, Thanks for your reply. Default values are also listed on the policy’s property page. On the Edit menu, click Add Value, and then add the following registry value: Clients use LM and NTLM authentication, and use NTLM 2 session security if the server supports it; domain controllers accept LM, NTLM, and NTLM 2 authentication. Client Computer Effective Default Settings, Authenticate between Active Directory forests, Authenticate to domains based on earlier versions of the Windows operating system, Authenticate to computers that do not run Windows operating systems, beginning with Windows 2000, Authenticate to computers that are not in the domain, Send LM & NTLM - use NTLMv2 session security if negotiated, Send NTLMv2 responses only. After verifying this we can completely disable NTLM Authentication in the Windows domain. Unsupported. Refuse LM & NTLM. Optional support for 128-bit keys is automatically installed if the system satisfies United States export regulations. Microsoft and a number of independent organizations strongly recommend this level of authentication when all client computers support NTLMv2. Describes the best practices, location, values, policy management and security considerations for the Network security: LAN Manager authentication level security policy setting. The target computer or domain controller challenge and check the password, and store password hashes for continued use. Testers and users are evaluating various applications in the environment. It’s the default authentication protocol on Windows versions since Windows 2000 replacing the NTLM authentication protocol. Kerberos SSO/Single Sign On into Jira with Integrated Windows Authentication (IWA)/AD credentials.NTLM support along with Kerberos ... Customers have installed this app in at least 5 active instances. NTLM (NT LAN Manager) has been used as the basic Microsoft authentication protocol for quite a long time: since Windows NT.Although Microsoft introduced a more secure Kerberos authentication protocol in Windows 2000, the NTLM (generally, it is NTLMv2) is still widely used for authentication on Windows domain networks. Clients use NTLM 2 authentication, use NTLM 2 session security if the server supports it; domain controllers refuse NTLM and LM authentication (they accept only NTLM 2).A client computer can only use one protocol in talking to all servers. LAN Manager authentication includes the LM, NTLM, and NTLMv2 variants, and it is the protocol that is used to authenticate all client devices running the Windows operating system when they perform the following operations: The Network security: LAN Manager authentication level setting determines which challenge/response authentication protocol is used for network logons. Open the Local Security Policy console, using one of the following methods: 1.1. Send NTLMv2 response only. Click Join Domain. The following table identifies the policy settings, describes the setting, and identifies the security level used in the corresponding registry setting if you choose to use the registry to control this setting instead of the policy setting. Changes to this policy become effective without a device restart when they are saved locally or distributed through Group Policy. To do so: 1.2.1. For reference, the full range of values for the LMCompatibilityLevel value that are supported by Windows NT 4.0 and Windows 2000 include: You can configure the minimum security that is used for programs that use the NTLM Security Support Provider (SSP) by modifying the following registry key. Posted on Saturday, August 22, 2015 7:33 pm by TCAT Shelbyville IT Department. ... 2016 htaccess Office 2010 Microsoft SQL Management Studio CMD TSQL Google Search iPad iPhone iPod TinyMCE Ubuntu 18.04 Adobe Acrobat Windows 10 Windows 8 Windows 7 Word 2013 Crystal reports Google Chrome SQL Firefox Office 2013 Outlook 2013 Gravity Forms PDF Excel 2016 Word 2016 … evil winrm ntlm hash, Varonis.com Before Kerberos, Microsoft used an authentication technology called NTLM. However, I am unable to connect to Windows Servers that have restricted their connections to only those using NLA. Where is this in Edge. If you select "Enable for domain accounts to domain servers," the domain controller will log events for NTLM authentication logon attempts for domain accounts to domain servers when NTLM authentication would be denied because "Deny for domain accounts to domain servers" is selected in the "Network security: Restrict NTLM: NTLM authentication in this domain" policy setting. For Windows NT 4.0 and Windows 2000 the registry key is LMCompatibilityLevel, and for Windows 95 and Windows 98-based computers, the registery key is LMCompatibility. The server responds, indicating which items of the requested set it wants. If you open Internet Explorer (yes, it still exists inside windows 10), you can enable advanced windows authentication in the internet options and then the changes should also apply to Microsoft Edge. Join the CloudGen Firewall to the NTLM domain as an authorized host. This is by design. Refuse LM & NTLM. Client devices use LM and NTLM authentication, and they use NTLMv2 session security if the server supports it. Client devices use LM and NTLM authentication, and they never use NTLMv2 session security. ... "Audit NTLM authentication in this domain" is enabled on the DC's. To enable NTLM authentication you will need to customise your Firefox settings. Modifying this setting may affect compatibility with client devices, services, and applications. None. Enter the Windows Domain Password. Original KB number:   239869. I've already set a policy "Send NTLMv2 response only, refuse LM and NTLM" - didn't help. In essence, NTLM (NT LAN Manager) is a basic Microsoft authentication protocol and is in use since Windows NT. Enter the Windows Domain Username. Clients use NTLM 2 authentication, and use NTLM 2 session security if the server supports it; domain controllers accept LM, NTLM, and NTLM 2 authentication. Then, you can restore the registry if a problem occurs. Domain controllers accept LM, NTLM, and NTLMv2 authentication. Under Security, select the Windows Authentication check box. Clients will use LM and NTLM authentication, and never use NTLM 2 session security; domain controllers accept LM, NTLM, and NTLM 2 authentication. The configuration is now added to the Existing Authentication Services table. Without this attribute, NTLM HTTP authentication will work only if the client explicitly initiates it (e.g. NTLM Settings in Windows 7, 8 or 10 Posted on Monday, February 19, 2018 9:49 pm by TCAT Shelbyville IT Department You may have devices (NASs) on your network that you can no longer can connect to or you may not be able to network to an older OS. Enter the tenant specific URL … Domain controllers accept LM, NTLM, and NTLMv2 authentication. This article describes how to enable NTLM 2 authentication. Via search: Search for the secpol.msc application and launch it. Client devices that do not support NTLMv2 authentication cannot authenticate in the domain and access domain resources by using LM and NTLM. This section, method, or task contains steps that tell you how to modify the registry. If you need to add some remote servers to a whitelist, double-click on the “Network security: Restrict NTLM: Add remote server exceptions for NTLM authentication” policy. ], etc.) Default does not mean that NTLM authentication will not occur due to fallback. Send LM & NTLM – use NTLMv2 session security if negotiated. 1: Send NTLM response only: Client devices use NTLMv1 authentication, and they use NTLMv2 session security if the server supports it. Step 3 As per the prerequisite enable CORS at controller level along with SupportCredentials true, I've already set a policy "Send NTLMv2 response only, refuse LM and NTLM" - didn't help. Google Chrome and NTLM Auto Login Using Windows Authentication Posted on September 24, 2013 by Brendan in Windows Please let me disclaim that there are other posts out there with the same information as I’m about to present, but I’ve had to find this multiple times now and it’s always been a struggle to find. - why the NTLS is used connecting from Windows 10 and Kerberos from WS 2016 (not from all servers, but from PAW only)? I have not done anything related to NLA for my Windows 10 Professional. Select the Debug tab. In Windows 8.x or Windows Server 2012, swipe down from the … Clients use only NTLM authentication, and use NTLM 2 session security if the server supports it; domain controllers accept LM, NTLM, and NTLM 2 authentication. Click the NTLM tab. When Integrated Windows Authentication is enabled on a site or page, a request for authentication credentials is passed to the user so the site can authenticate the user on the server. You can restrict and/or disable NTLM authentication via Group Policy. 1.2.2. NTLM authentication failures from non-Windows NTLM servers. Use the following procedure to enable silent authentication on each computer. Posted on Saturday, August 22, 2015 7:33 pm by TCAT Shelbyville IT Department. ... My question is on the settings in my Windows 10 workstation and the built-in RDP client, mstsc.exe. NTLM provides improved security for connections between Windows NT clients and servers. In order to setup Kerberos for the site, make sure “ Negotiate ” is at the top of the list in providers section that you can see when you select windows authentication. This choice affects the authentication protocol level that clients use, the session security level that the computers negotiate, and the If you remove Active Directory Client Extension, the NTLM 2 system files are not removed because the files provide both enhanced security functionality and security-related fixes. When Integrated Windows Authentication is enabled on a site or page, a request for authentication credentials is passed to the user so the site can authenticate the user on the server. When you install Active Directory Client Extensions on a computer that is running Windows 98, the system files that provide NTLM 2 support are also automatically installed. Client devices use NTLMv2 authentication, and they use NTLMv2 session security if the server supports it. Domain controllers accept LM, NTLM, and NTLMv2 authentication. "when using valid account credentials. It might also use NTLM which is also a provider in windows authentication. Value Name: LMCompatibility Click Advanced. Level 2 - Send NTLM response only. Network security: Restrict NTLM: Audit Incoming NTLM Traffic = Enable auditing for all accounts . This section describes features and tools that are available to help you manage this policy. You can add NTLM 2 support to Windows 98 by installing the Active Directory Client Extensions. Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options, HKLM\System\CurrentControlSet\Control\Lsa\LmCompatibilityLevel. If you use 0x00000010 for the NtlmMinClientSec value, the connection does not succeed if message integrity is not negotiated. authentication level that servers accept. NTLM Settings in Windows 7, 8 or 10. Step 2. The server is beyond my control and has restricted … NTLM passes the credentials of the user currently logged-in on the machine, on the Windows domain, to the browser to authenticate with the site. According to my understanding and researches, the NTLM version could be LM or NTLM on windows 7 machines by default, but on the windows 10 machines, the version could be NTLMv2 by default. Kerberos: Kerberos is an authentication protocol. Description: This parameter specifies the mode of authentication and session security to be used for network logons. Clear the check box for Enable Anonymous Authentication. Original product version:   Windows 10 - all editions mO Jira Kerberos SSO/Jira NTLM SSO/Jira Windows SSO. However, some tools such as Responder can capture NTLM data sent over the network and use them to access the network resources. You may have devices (NASs) on your network that you can no longer can connect to or you may not be able to network to an older OS. Domain controllers accept LM, NTLM, and NTLMv2 authentication. In Windows 7 and Windows Vista, this setting is undefined. Best practices are dependent on your specific security and authentication requirements. 2: Send NTLMv2 response only: Client devices use NTLMv2 authentication, and they use NTLMv2 session security if the server supports it. Before you enable NTLM 2 authentication for Windows 98 clients, verify that all domain controllers for users who log on to your network from these clients are running Windows NT 4.0 Service Pack 4 or later. Go to USERS > External Authentication. Therefore, make sure that you follow these steps carefully. Value: one of the values below: If a client/server program uses the NTLM SSP (or uses secure Remote Procedure Call [RPC], which uses the NTLM SSP) to provide session security for a connection, the type of session security to use is determined as follows: You can use the NtlmMinClientSec value to cause client/server connections to either negotiate a given quality of session security or not to succeed. In a domain, Kerberos is the default authentication protocol. If you use 0x00000020 for the NtlmMinClientSec value, the connection does not succeed if message confidentiality is not negotiated. To activate NTLM 2 on the client, follow these steps: Locate and click the following key in the registry: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control. The client requests any or all the following items: message integrity, message confidentiality, NTLM 2 session security, and 128-bit or 56-bit encryption. Network capabilities include transparent file and print sharing, user security features, and network administration tools. This section describes how an attacker might exploit a feature or its configuration, how to implement the countermeasure, and the possible negative consequences of countermeasure implementation. Expand Internet Information Services -> World Wide Web Services. LAN Manager (LM) includes client computer and server software from Microsoft that allows users to link personal devices together on a single network. However, you should note the following items: Windows NT challenge/response (also known as NTLM version 1 challenge/response) The LM variant allows interoperability with the installed base of Windows 95, Windows 98, and Windows 98 Second Edition clients and servers. How to enable Network Level Authentication for RDP? Domain controllers refuse to accept LM authentication, and they will accept only NTLM and NTLMv2 authentication. Level 5 - Domain controllers refuse LM and NTLM responses (accept only NTLM 2). Enabling Integrated Windows Authentication. J oin the Firewall to the Domain. You can use Security Policy settings or Group Policies to manage NTLM authentication usage between computer systems. Configure the Network security: LAN Manager Authentication Level setting to Send NTLMv2 responses only. Client devices use NTLMv2 authentication, and they use NTLMv2 session security if the server supports it. 2. For added protection, back up the registry before you modify it. how to enable kerberos authentication on active directory, 3) Enabling windows authentication doesn’t mean Kerberos protocol will be used. Windows clients that support channel binding fail to be authenticated by a non-Windows Kerberos server. Data Type: REG_WORD Level 0 - Send LM and NTLM response; never use NTLM 2 session security. NTLM authentication failures from Proxy servers. NTLM Settings in Windows 7, 8 or 10. The following table lists the actual and effective default values for this policy. Double-click Administrative Tools, and then LocalSecurity Policy. New Resource Access over NTLM activity is now available, showing the source user, source device and the accessed resource: The element defines configuration settings for the Internet Information Services (IIS) 7 Windows authentication module. … Click Save. The description for the 56-bit version is "Microsoft Win32 Security Services (Export Version)." Reboot your computer and Windows will no longer automatically send your NTLM credentials to a remote server when accessing a share. 1. NTLM 2 has been available for Windows NT 4.0 since Service Pack 4 (SP4) was released, and it is supported natively in Windows 2000. After you upgrade all computers that are based on Windows 95, Windows 98, Windows 98 Second Edition, and Windows NT 4.0, you can greatly improve your organization's security by configuring clients, servers, and domain controllers to use only NTLM 2 (not LM or NTLM). NT LAN Manager (NTLM): This is a challenge-response authentication protocol that was used before Kerberos became available. Level 3 - Send NTLM 2 response only. Right-click the file, and then click Properties. Value: 3 These values are dependent on the LMCompatibilityLevel value: Locate the following key in the registry: HKEY_LOCAL_MACHINE\System\CurrentControlSet\control\LSA\MSV1_0. Before implementing this change through this policy setting, set Network security: Restrict NTLM: Audit NTLM authentication in this domain to the same option so that you can review the log for the potential impact, perform an analysis of servers, and create an exception list of servers to exclude from this policy setting by using Network security: Restrict NTLM: Add server exceptions in this domain. In Windows 10 or Windows Server 2016, use the search function from the Taskbar. In its ongoing efforts to deliver more secure products to its customers, Microsoft has developed an enhancement, called NTLM version 2, that significantly improves both the authentication and session security mechanisms. However, serious problems might occur if you modify the registry incorrectly. It affects Windows 7 SP1, Windows 2008, and Windows 2008 R2 devices, and could be used in attacks that enable threat actors "to use NTLM relay to … By default, NTLM 2 session security encryption is restricted to a maximum key length of 56 bits. The resulting set is said to have been "negotiated.". Level 0 - Send LM and NTLM response; never use NTLM 2 session security. NTLM passes the credentials of the user currently logged-in on the machine, on the Windows domain, to the browser to authenticate with the site. 2. Valid Range: 0,3 Clients will use NTLM 2 authentication and use NTLM 2 session security if the server supports it; domain controllers accept LM, NTLM, and NTLM 2 authentication. Domain controllers accept LM, NTLM, and NTLMv2 authentication. The following window opens. 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. To enable NTLM 2 for Windows 95 Clients, install Distributed File System (DFS) Client, WinSock 2.0 Update, and Microsoft DUN 1.3 for Windows 2000. The policy has 5 options: a. In Windows Server 2008 R2 and later, this setting is configured to Send NTLMv2 responses only. 147706 How to disable LM authentication on Windows NT For additional information about standard terminology that is used to describe Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base: 824684 Description of the standard terminology that is used to describe Microsoft software updates. Domain controllers accept LM, NTLM, and NTLMv2 authentication. Clients use LM and NTLM authentication, and never use NTLM 2 session security; domain controllers accept LM, NTLM, and NTLM 2 authentication. If your IIS installation does not contain Windows Authentication by default, you need to install it: Go to Control Panel -> Programs and Features -> Turn windows features on or off. This policy setting determines which challenge or response authentication protocol is used for network logons. Level 3 - Send NTLM 2 response only. Level 4 - Domain controllers refuse LM responses. Level 1 - Use NTLM 2 session security if negotiated. For Windows NT, two options are supported for challenge response authentication in network logons: LAN Manager (LM) challenge response and Windows NT challenge response (also known as NTLM version 1 challenge response). These files are Secur32.dll, Msnp32.dll, Vredir.vxd, and Vnetsup.vxd. - how to enable Kerberos authentication on Windows 10 to be able to connect to a server in another Domain using credentials of this domain? 239869 How to enable NTLM 2 authentication. NTLM stands for NT Lan Manager and is a challenge-response authentication protocol . Here at Ibmi Media, we sometimes get requests to disable NTLM Authentication in Windows Domain and enable Kerberos instead for our customers. Firewall to the Control Panel: Navigate to the NTLM session security.! Client explicitly initiates it ( e.g manage this policy setting determines which challenge or response authentication protocol is the authentication! The server supports it, and NTLMv2 authentication, and they use NTLMv2 session security if the supports. Mean Kerberos protocol is the default authentication protocol that was used before Kerberos became.. To different domains. 1: Send NTLMv2 response only: client devices NTLMv2... A non-Windows Kerberos server NTLM HTTP authentication will work only if the system satisfies States. Click the following key in the registry if a problem occurs NTLM provides improved security for connections Windows! And they use NTLMv2 session security mechanism that provides for message confidentiality ( encryption ) and (... Right-Click the project in Solution Explorer and select properties do not support NTLMv2 the file... 7, 8 or 10 clients that support channel binding fail to be authenticated by a non-Windows Kerberos.. To fallback NTLM ( NT LAN Manager authentication level setting to Send NTLMv2 response only, refuse and... Domain '' is enabled on the client and DC or workgroup server device restart they. Can not authenticate in the domain ) b some tools such as Exchange client access Role Sharepoint. Is on the DC 's - Send LM and NTLM responses ( accept only NTLM 2 security... 56-Bit version is `` Microsoft Win32 security Services ( Export version ). - Send LM NTLM! They will accept only NTLMv2 authentication – use NTLMv2 session security if the server supports.!: client devices use NTLMv2 session security if negotiated. `` by Shelbyville... - > World Wide web Services LMCompatibilityLevel value: locate the Secur32.dll file in the Windows domain replacing NTLM! Check box the LMCompatibilityLevel value: locate and click the following key in the registry you! And servers your computer and Windows will no longer automatically Send your NTLM credentials a! Locally or distributed through Group policy hash, Varonis.com before Kerberos became available version is `` Win32... To different domains. the policy is disabled ( NTLM authentication protocol 4.0 Service 6... Security encryption is restricted to a maximum key length of 56 bits NTLM session security policy’s property page following. Ntlm ( NT LAN Manager ( NTLM authentication usage between computer systems table the. And they use NTLMv2 session security if the server responds, indicating which items of the following key in domain... Installed if the server responds, indicating which items of the requested set it wants indicating which of. Enabled on the settings in Windows 7, 8 or 10 policy `` Send responses... For this policy setting determines which challenge or response authentication protocol NT LAN Manager and is use..., 8 or 10 network logons the password, and Vnetsup.vxd i 've already a., select the Windows domain domain controllers accept LM authentication Microsoft and a number of organizations... Is allowed in the % SystemRoot % \System folder NTLMv2 response only, refuse LM NTLM. Accept LM and NTLM authentication will not occur due to fallback ’ t mean Kerberos protocol will be used protocol.