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How to Fix Authentication Failed in Command Prompt - Check if a Port Is Already Allocated Using Command Prompt-Fix Task Scheduler Not Running After Windows Update

Updated 2026-06-13 19:37:13office-tools
How to Fix Authentication Failed in Command Prompt - Check if a Port Is Already Allocated Using Command Prompt-Fix Task Scheduler Not Running After Windows Update
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.