🔴 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.

Illustrative mockup for windows-server-2022 — terminal_or_powershell
Diagnostics commands in PowerShell — Illustrative mockup — Progressive Robot
Illustrative mockup for windows-server-2022 — event_or_log_viewer
Event log verification for Windows Server 2022 — Illustrative mockup — Progressive Robot

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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