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How to Manually Activate a Python Virtual Environment - Resolve Cloudflare 521 Error on Apache-Fix ERR_NAME_NOT_RESOLVED on Windows 10

Updated 2026-07-28 05:30:13developer-tools
How to Manually Activate a Python Virtual Environment - Resolve Cloudflare 521 Error on Apache-Fix ERR_NAME_NOT_RESOLVED on Windows 10
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.