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How to Fix Cloudflare 521 Error with Firewall Settings - Fix ERR_NAME_NOT_RESOLVED in Chrome with Network Reset-How to Set Git Proxy for Clone Timeouts

Updated 2026-07-28 05:40:37developer-tools
How to Fix Cloudflare 521 Error with Firewall Settings - Fix ERR_NAME_NOT_RESOLVED in Chrome with Network Reset-How to Set Git Proxy for Clone Timeouts
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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