How To Fix Max 2000 LAN Security Errors


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    You may receive an error message indicating the maximum 2000 LAN security error. There are several ways to solve this problem, which we will discuss shortly.



    • 7 minutes to read.

    Applies to: Windows 10 – all editions
    Original Knowledge Base Number: 239869


    Historically, Windows NT has supported two Challenge / Response certification options for network connections:

    • LAN Manager (LM) Request / Response
    • Windows NT Challenge / Response (also known as NTLM Single Challenge / Response) The LM option provides interoperability with an installed base of Windows 95, Windows 98, and Windows 98 Second Edition for new clients and servers. NTLM provides enhanced security for connections between Windows NT clients and web servers. Windows NT also supports the NTLM-Shoot security mechanism, which ensures confidentiality (encryption) and integrity (signature) of messages.

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    Recent improvements in computer algorithms and software have made these types of protocols vulnerable to widespread attacks required to obtain user passwords. Continuously striving to offer its customers ever more secure products, Microsoft has developed the NTLM Version 2 extension that It does not significantly improve authentication and session security mechanisms. NTLM 2 has been available for NT 4.0 since the release of Windows Service Pack 4 (SP4), and has been natively supported on Windows since 2000. You can add four NTLM media to Windows 98 by installing most of the Active Client Extensions Directory.

    After upgrading all computers running Windows 94, Windows 98, Windows 98 Second Edition, in addition to Windows NT 4.0, you can significantly reduce the security of your business by configuring clients, nodes, and controllers. domain only for this. NTLM 2 LM is used (not NTLM).

    Additional Information

    If a person installs Active Directory client extensions on a good Windows 98 computer, your system files will be automatically installed using NTLM 2. These files look like Secur32.dll, Msnp32.dll, Vredir. vxd and Vnetsup.vxd. … If you actually uninstall the Active Directory Client Extension, the main reason NTLM 2 system files are not removed is because the files provide both increased security and fixes for security-related features.

    Default secure cipherNTLM 2 is limited to a potential key length of 56 bits. An additional 128-bit key request will be automatically installed if it meets the US requirements for international connectivity prior to installing Active Directory client extensions.

    1. Usually, using Windows Explorer, locate the Secur32 .File-DLL file in the% SystemRoot% System folder.
    2. Right-click the file and select Properties.
    3. Click the Version tab. The description for the 56-bit version is usually “Microsoft Win32 Security Services version (export”). The description for the 128-bit version is Microsoft Win32 Security Services (US and Canada only).

    Before enabling NTLM Two-Factor Authentication for Windows 98 clients, ensure that the majority of domain controller users accessing your network from these programs are running Windows NT 4.0 Pack Plan 4 or later. (Domain controllers are running Windows NT.) 4.0 Service 6 is in standby mode if the client and server are in different domains.) The domain controller system is not required to support 2 ntlm. You just needbut configure domain controllers to remove support for NTLM 1 or LM.NTLM authentication

    Activate 2 For Windows 95, Windows 1996 Or Windows 98 Second Edition Clients

    To support Windows 95 client, Windows 98, possibly Windows 98 Second Edition for second NTLM authentication, install the Directory Services client. To enable NTLM 2 on the client, learn more about these steps:

    1. Start Registry Editor (Regedit.exe).

    2. Find the following registry key and click it: hkey_local_machine system currentcontrolset control

    3. Create an LSA registry key under the personal computer key above.

    4. max 2000 lan security error

      On the Edit menu, click Add Value and add the following registry value:
      Value name: LMCompatibility
      Data type: REG_DWORD
      Value: 3
      Valid 0.3
      Description: Range: This parameter defines the session and security authentication procedure that should typically be used for network connections. Do this and never interfere with interactive connections.

      • Level 0 – sending a response to LM and NTLM; Never use NTLM to secure your sessions. LM customers continue Do not use NTLM authentication and never use NTLM 2.5 security sessions; Domain controllers accept LM, NTLM and NTLM 2.3 authentication

      • max 2000 lan security error

        level – send only NTLM 2 response. Clients require 2 ntlm authentication and use ntlm session security only if the server can handle it; Domain controllers accept second LM, NTLM and ntlm authentication.


      To enable NTLM 2 for Windows 95 clients, install the Distributed File System (DFS) client, WinSock 2.0 update, and Microsoft dun.3 for Windows 2000.

    5. Close the registry editor.

    For reference, the full range of LMCompatibilityLevel values ​​supported by Windows under NT 4.0 and Windows 2000 includes:

    • Level 1 – sending a response to LM and NTLM; Never use ntlm session security 2 before. Clients use NTLM authentication and never choose NTLM 2 session security; Domain controllers trust LM, NTLM, and NTLM 2 authentication.
    • Use session level 1 – NTLM 2 security during negotiation. Clients use LM and NTLM validation and use NTLM 2 session security if the server supports the domain. Controllers use LM, NTLM, and NTLM 2 authentication.
    • Pair Level – Reply Send – NTLM only. Clients only use NTLM authentication and NTLM A-peer session security when the server looks for them; The controller domain accepts LM, NTLM, and NTLM 2 authentication.
    • Level 3 – Send NTLM only a couple of responses. Use NTLM 2 client authentication and NTLM 2 session security if the server supports it. Domain controllers allow LM, NTLM and NTLM 2 authentication.
    • Level – A number of domain controllers are discarding LM responses. Clients use NTLM authentication and use NTLM security for multiple sessions if the server allows it; Domain controllers refuse LM authentication (that is, they usually accept NTLM and NTLM 2).
    • Level Three – Domain Controllers reject LM and ntlm responses (only accept NTLM 2). Clients use NTLM 2 authentication, use NTLM 2 disk protection if the server supports it; Sector controllers disallow NTLM and LM authorization (they only accept NTLM 2). The client computer will most likely use only one prototype.okol that can be used by all servers. For example, you cannot configure it by using NTLM v2 to communicate with Windows 2000 servers and then helping NTLM connect to other companies. This is by design.

    You can often configure the minimum security used for settings that use the NTLM Security Support Provider (SSP) by modifying the following registry. These values ​​depend on the LMCompatibilityLevel value:

    1. Start Registry Editor (Regedit.exe).

    2. Find the following key entries in the registry: HKEY_LOCAL_MACHINE System CurrentControlSet control LSA MSV1_0

    3. In the Edit compilation, click Add Value and add the following registry value:
      Value name: NtlmMinClientSec
      Data type: REG_WORD
      Value: one of the following values:

      • 0x0000010- Message Integrity
      • 0x00000020- Message privacy
      • 0x00080000 – NTLM 2 session security
      • encryption 0x20000000
      • Encryption 0x80000000 – 128-56 bits
    4. Close the registry editor.

    If a large client / server program uses NTLM SSP (or uses secure remoteIf the procedure call [RPC], which has an NTLM SSP) to provide basic session security for the connection, the type to use is workshop security, so far as follows:

    • The client requests all or part of the above: message integrity, message confidentiality, NTLM 2 session security, and 128-bit or 56-bit encryption.
    • The web hosting server will respond and display the elements of the requested phrase it needs.
    • The resulting proposed proposal had to be “matched”.

    You can apply



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