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Fix Chrome ERR_TUNNEL_CONNECTION_FAILED on Windows 10 - Fix Windows Defender Token Expired Preventing Service Start-Troubleshoot Windows Defender File Locked Issue

2026-06-13 15:03:31
Fix Chrome ERR_TUNNEL_CONNECTION_FAILED on Windows 10 - Fix Windows Defender Token Expired Preventing Service Start-Troubleshoot Windows Defender File Locked Issue

Result check

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

Next references

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