Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When you see fatal: unable to access 'https://...': SSL certificate problem: unable...

Python Requests Timeout Not Waiting: Fixes and Checks
You set a timeout in Python's requests library, but the call either hangs foreve...

Python Requests: Fixing Connection Timeout with Proxies
You're using the Python requests library with a proxy, and you're seeing a <...

Fix 'Externally Managed Environment' Error on Linux
If you're on a modern Linux distribution (Ubuntu 23.04+, Debian 12+, Fedora 38+, etc.) and ge...

Python Virtual Environment Not Activating: Common Fixes
You run source venv/bin/activate (or venv\Scripts\activate on Windows) ...

Fix Docker Network Not Found Error (Code 255)
When you run a Docker container and get an error like docker: Error response from daemon: n...