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Home / developer-tools / Fix Chrome Profile Failed to Start in Safe Mode - Fix Windows Defender Sync Error 504 Gateway Timeout-Chrome User Profile Won't Load – Troubleshooting Guide

Fix Chrome Profile Failed to Start in Safe Mode - Fix Windows Defender Sync Error 504 Gateway Timeout-Chrome User Profile Won't Load – Troubleshooting Guide

Updated 2026-06-14 03:26:20developer-tools
Fix Chrome Profile Failed to Start in Safe Mode - Fix Windows Defender Sync Error 504 Gateway Timeout-Chrome User Profile Won't Load – Troubleshooting Guide
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.

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