Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you're on a modern Linux distribution and try to install a Python package with pip, you ma...

You're trying to install a Windows update, but it fails with error code 0x800f081f and the me...

If you see connect() failed (111: Connection refused) or connect() failed (13:...

Fixing Nginx Upstream Connection Refused on Port 443
You see "upstream connection refused" in your Nginx error log when proxying requests to p...

Fix npm 'package.json not found' Error in Subdirectories
You're working in a subdirectory of your project, run npm install or npm r...

Fix Git Clone Connection Timed Out on AWS CodeCommit
If you're seeing git clone connection timed out when trying to clone a repositor...