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Home / developer-tools / Fix Windows Security Proxy 504 Gateway Timeout Configuration - Force Delete Locked File with PowerShell: Step-by-Step-Fix Windows Defender Auth Failed: Step-by-Step

Fix Windows Security Proxy 504 Gateway Timeout Configuration - Force Delete Locked File with PowerShell: Step-by-Step-Fix Windows Defender Auth Failed: Step-by-Step

2026-06-13 17:24:58
Fix Windows Security Proxy 504 Gateway Timeout Configuration - Force Delete Locked File with PowerShell: Step-by-Step-Fix Windows Defender Auth Failed: Step-by-Step

Result check

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