Fix Edge Sync Stuck on Sign-In Loop - Docker Desktop Update Broke Engine: Solutions-How to Fix Cloudflare Error 521: Server Not Responding

Updated 2026-07-28 09:18:21macos-help
Fix Edge Sync Stuck on Sign-In Loop - Docker Desktop Update Broke Engine: Solutions-How to Fix Cloudflare Error 521: Server Not Responding
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.