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Fix ERR_SSL_PROTOCOL_ERROR on Windows 10 - How to Fix Port Already in Use by Windows Defender Firewall-How to Stop FileZilla FTP Timeouts

2026-06-13 15:42:44
Fix ERR_SSL_PROTOCOL_ERROR on Windows 10 - How to Fix Port Already in Use by Windows Defender Firewall-How to Stop FileZilla FTP Timeouts

Result check

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