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Docker Container Exits Immediately in Docker Compose - Troubleshooting Cloudflare 521 Error: Port 443 Blocked-Resolving pip Permission Errors: Practical Steps

2026-07-28 11:15:39
Docker Container Exits Immediately in Docker Compose - Troubleshooting Cloudflare 521 Error: Port 443 Blocked-Resolving pip Permission Errors: Practical Steps

Result check

  • Keep one change per test run so you know which step helped.
  • Undo temporary changes after the issue is confirmed.

Next references

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