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How to Fix Windows Defender 502 Bad Gateway Error - Troubleshoot Chrome 404: Extensions as Culprit-Chrome ERR_TUNNEL_CONNECTION_FAILED: Antivirus Blocking Troubleshoot

2026-06-14 05:00:29
How to Fix Windows Defender 502 Bad Gateway Error - Troubleshoot Chrome 404: Extensions as Culprit-Chrome ERR_TUNNEL_CONNECTION_FAILED: Antivirus Blocking Troubleshoot

Result check

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