🔴 Critical   ⏱ 5–30 min  Last verified: 19 May 2026
Affected versions: Windows Server 2022

📖 ~1 min read

Table of contents
  1. Symptom & Impact
  2. Environment & Reproduction
  3. Root Cause Analysis
  4. Quick Triage
  5. Step-by-Step Diagnosis
  6. Solution – Primary Fix
  7. Solution – Alternative Approaches
  8. Verification & Acceptance Criteria
  9. Rollback Plan
  10. Prevention & Hardening
  11. Related Errors & Cross-Refs
  12. References & Further Reading

Symptom & Impact

New user sessions are denied because RDS grace period has expired and no valid licensing path is available.

Environment & Reproduction

Seen when license server is decommissioned, DNS records are stale, or licensing mode is mismatched.

Root Cause Analysis

Session host cannot locate a valid license server or CAL mode does not match installed CAL type.

Quick Triage

Confirm configured licensing mode, discoverable license server, and relevant TerminalServices licensing events.

Step-by-Step Diagnosis

Check RD Licensing Diagnoser output, GPO RDS settings, and connectivity from session host to license server endpoints.

Solution – Primary Fix

Set correct RDS licensing mode, publish valid license servers via GPO, and verify CAL activation status.

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Solution – Alternative Approaches

In emergency windows, use temporary access path for remediation while licensing server restoration is completed.

Verification & Acceptance Criteria

Users can open new sessions successfully and licensing diagnostics report no critical findings.

Rollback Plan

Revert recent RDS policy edits if session admission worsens and restore known-good licensing server settings.

Prevention & Hardening

Track grace period lifecycle, monitor license server health, and include CAL compliance checks in monthly operations.

Frequently linked with NLA auth issues, DNS service discovery failures, and certificate trust problems.

Related tutorial: View the step-by-step tutorial for Windows Server 2022.

View all Windows Server 2022 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Use Microsoft RDS licensing deployment and troubleshooting documentation to maintain compliant session host access.

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