Checklists for software errors, setup, and tool workflows.

Docker Compose 'Network Not Found' Error Fix

When running docker compose up, you might see an error like:

network "my...

Fix pip install: Dependency Conflict and Permission Denied

When you run pip install and see messages about dependency conflicts or permission d...

Fix Python venv Not Activating in CMD

You create a virtual environment with python -m venv myenv, navigate to the Scripts ...

How to Fix Nginx 502 Bad Gateway in Docker Compose

If you're running an application with Docker Compose and Nginx as a reverse proxy, a 502 Bad ...

How to Fix Nginx 'Upstream Connection Refused' Error

When Nginx returns a 502 Bad Gateway with upstream connection refused in the error l...

Fix Cloudflare Origin Certificate with Let's Encrypt

If your origin server is rejecting the Cloudflare origin certificate—perhaps because of a SAN mis...