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public:5342_lan_manager_auth_level_must_be_3_or_higher

ISSUE: LAN manager authentication level must be 3 or higher (cannot create MS Exchange mail level backup)

Article ID: 5342
Reviewed: 24/05/2018

Product Version:
AhsayOBM: 7.3.0.0 or above
OS: Windows

Problem Description

When creating a MS Exchange Mail Level Backup Set, the following error message is displayed:

LAN Manager authentication level must be 3 or higher.

Cause

The error message suggested that for the domain which the Exchange server reside, the Network security: LAN Manager authentication level policy setting must be set to level 3 or higher (Registry security level), which is one of the following:

  • Send NTLMv2 response only
  • Send NTLMv2 response only. Refuse LM
  • Send NTLMv2 response only. Refuse LM & NTLM
Reference: https://docs.microsoft.com/en-us/windows/security/threat-protection/security-policy-settings/network-security-lan-manager-authentication-level

Resolution

To resolve the issue, please refer to the following steps:

  • Open Local Security Policy from Administrative Tools.

  • Under Security Settings, expand Local Policies, Security Options, Network security: LAN Manager authentication level.

  • Ensure that the setting is configured to use NTLMv2, for example:

    • Send NTLMv2 response only
    • Send NTLMv2 response only. Refuse LM
    • Send NTLMv2 response only. Refuse LM & NTLM

Keywords

lan, manager, obm, ahsayobm, exch, exchange, msexchange, auth, authentication

public/5342_lan_manager_auth_level_must_be_3_or_higher.txt · Last modified: 2018/05/24 10:34 by edward.chan