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Fix 'File in Use' Error When Searching in Windows Explorer - Troubleshoot Firefox Secure Connection Failed in Windows 10-How to Fix Port Already in Use by Windows Defender Firewall

2026-06-14 05:41:18
Fix 'File in Use' Error When Searching in Windows Explorer - Troubleshoot Firefox Secure Connection Failed in Windows 10-How to Fix Port Already in Use by Windows Defender Firewall

Result check

  • Keep one change per test run so you know which step helped.
  • Undo temporary changes after the issue is confirmed.