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How to Clear DNS Cache to Fix ERR_NAME_NOT_RESOLVED - Cloudflare 521 Error: Authenticated Origin Pulls Setup-Bypass pip Externally Managed Error with venv

Updated 2026-07-28 08:52:22macos-help
How to Clear DNS Cache to Fix ERR_NAME_NOT_RESOLVED - Cloudflare 521 Error: Authenticated Origin Pulls Setup-Bypass pip Externally Managed Error with venv
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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