Knowledge base for software setup, errors, and daily tool work.

Cloudflare Origin Certificate Setup Checklist

If you're setting up a Cloudflare origin certificate to encrypt traffic between Cloudflare an...

Resolving Python Dependency Conflicts in setup.py

When you run pip install . or python setup.py develop, a dependency con...

Fix Python Permission Denied on pip install --no-cache-dir

You try to install a Python package with pip install --no-cache-dir somepackage and ...

Nginx Upstream Connection Refused: Diagnosis and Fixes

When Nginx returns a 502 Bad Gateway or logs "upstream connection refused", it means Ngin...

Fix Virtual Environment Not Activating in Terminal

Why Your Virtual Environment Won't Activate

You open a terminal, navigate to your pro...

Fix VS Code 'Permission Denied' When Saving Files

You're editing a file in Visual Studio Code, hit Ctrl+S, and get an error: "Failed to sav...