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White PaperNTLMv1Active DirectoryLegacy AuthenticationApr 2026

Identity Security for Modern Organizations: A Roadmap for Disabling NTLMv1

A practical, phased roadmap for safely identifying, auditing, and disabling NTLMv1 across enterprise Active Directory environments without breaking legacy applications.

Serdal Tarkan AltunSecurity Research Engineer
20 min readPDF40 pages19.4 MB

What you’ll learn

  • Inventory and audit NTLMv1 authentication usage across domains and applications
  • Plan a phased rollout from monitoring mode to full enforcement without breaking production
  • Apply hardening Group Policies and validate the change with measurable success criteria

Outline

  1. Why NTLMv1 must be retired
  2. Risks of leaving legacy authentication enabled
  3. Discovery: enabling NTLM auditing and collecting baseline events
  4. Identifying clients and applications still using NTLMv1
  5. Phased rollout plan and rollback strategy
  6. Group Policy and registry hardening references
  7. Validation, monitoring, and ongoing governance

See your identity exposure clearly.

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Identity Security for Modern Organizations: A Roadmap for Disabling NTLMv1 | White Papers | Forestall