Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When using Python's ftplib to download or list files from an FTP server, you mig...

When your Python script using the requests library hangs or raises a ConnectTi...

Resolving Python Dependency Conflicts in setup.py
When you run pip install . or python setup.py develop, a dependency con...

Fixing NGINX Upstream Connection Refused SSL Errors
When NGINX logs upstream connection refused for an SSL backend, it usually means the...

Fix Python Permission Denied When Installing Packages
You try to install a Python package with pip and get a PermissionError: [Errno 13] Permissi...

How to Fix Limited Connectivity on Windows 11 Wi-Fi
You connect to Wi-Fi but see "Limited connectivity" or "No internet, secured." Yo...