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Fix Python pip SSL Certificate Verify Failed Error - ERR_TUNNEL_CONNECTION_FAILED Troubleshooting Guide-Troubleshoot Windows Defender Startup Failure Due to Other AV

2026-06-13 13:19:22
Fix Python pip SSL Certificate Verify Failed Error - ERR_TUNNEL_CONNECTION_FAILED Troubleshooting Guide-Troubleshoot Windows Defender Startup Failure Due to Other AV

Result check

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