Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You're seeing a Cloudflare 522 error: connection timed out between Cloudflare and your origin...

If you see an error like fatal: Unable to create 'project/.git/index.lock': File ex...

Fix Git SSL Certificate Problem: Unable to Get Local Issuer
If you see fatal: unable to access 'https://...': SSL certificate problem: unable t...

Fix Firefox Secure Connection Failed Due to Cache
You see a 'Secure Connection Failed' error in Firefox, often with messages like PR_CO...

Fix Docker Compose Port Already Allocated on Linux
You run docker-compose up and get an error like Error starting userland proxy:...

Fix VS Code 'Cannot Save File: Permission Denied' on Mac
You're editing a file in VS Code on your Mac, hit save, and get: 'Failed to save:...