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Home / developer-tools / Fix OneDrive Sync SSL Certificate Error - PowerShell 504 Gateway Timeout: Diagnosis and Resolution Checklist-Windows Update Connection Refused with VPN: Fix

Fix OneDrive Sync SSL Certificate Error - PowerShell 504 Gateway Timeout: Diagnosis and Resolution Checklist-Windows Update Connection Refused with VPN: Fix

2026-06-17 15:44:01developer-tools
Fix OneDrive Sync SSL Certificate Error - PowerShell 504 Gateway Timeout: Diagnosis and Resolution Checklist-Windows Update Connection Refused with VPN: Fix

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.