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Fix Windows Defender Connection Timeout Error 0x80070422 - Fix OneDrive Sync Service Unavailable on Windows 10-Outlook Hangs When Opening Attachments: How to Fix

Updated 2026-06-14 03:21:57office-tools
Fix Windows Defender Connection Timeout Error 0x80070422 - Fix OneDrive Sync Service Unavailable on Windows 10-Outlook Hangs When Opening Attachments: How to Fix
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.