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What is Network security: Restrict NTLM: Audit NTLM authentication in this domain setting?
Written by Titus Manohar, IT security team, ManageEngine • Updated on April 2026
Network security: Restrict NTLM: Audit NTLM authentication in this domain is a security policy setting that audits the authentication traffic to that domain controller. NTLM is an older Windows authentication software that has been known to be vulnerable to man-in-the-middle (MITM) attacks, brute force attacks, SMB relay and so on. Therefore auditing the incoming traffic for NTLM authentication can help a network administrator decide whether NTLM authentication should be restricted on the network.
The possible values for this policy:
- Disable: The domain controller will not audit the NTLM authentication traffic.
- Enable for domain accounts to domain servers: This will log events for NTLM authentication requests from domain accounts to domain servers.
- Enable for domain accounts: This will log events when domain accounts send NTLM authentication requests.
- Not defined: This policy is not defined and hence the NTLM authentication traffic will not be audited.
About ADAudit Plus:
ADAudit Plus is a real time change auditing software that helps keep your Active Directory,Azure AD, Windows file servers, NetApp filers, EMC file systems, Synology file systems, Windows member servers, and workstations secure and compliant. With ADAudit Plus, you can get visibility into:
- Authorized and unauthorized AD management changes
- User logons, logoffs, and account lockouts
- GPO changes
- Group attribute and membership changes
- OU changes
- Privileged access and permission changes
- Azure AD logons, and changes to roles, groups, and applications
- PowerShell scripts and modules
among other things.
There are more than 200 event-specific reports, and you can configure instant email alerts. You can also export the reports to XLS, HTML, PDF and CSV formats to assist in interpretation and forensics.