Fix Cloudflare 521 Error: SSL Configuration Steps - How to bypass pip externally-managed-environment on Ubuntu 23.04-Docker Container Stops Right After Starting: Entrypoint Fix

Updated 2026-07-28 13:32:41macos-help
Fix Cloudflare 521 Error: SSL Configuration Steps - How to bypass pip externally-managed-environment on Ubuntu 23.04-Docker Container Stops Right After Starting: Entrypoint Fix
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.