Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

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Latest checklists

Fix Nginx Configuration Test Failure for Upstream Directive

Fix Nginx Configuration Test Failure for Upstream Directive

When you run nginx -t and get an error involving the upstream directive...

Fix DNS Probe Finished NXDOMAIN After Changing DNS

Fix DNS Probe Finished NXDOMAIN After Changing DNS

After updating your DNS settings—perhaps to use Google Public DNS or Cloudflare—you might see the...

Fix Nginx 'upstream connection refused' When Talking to PHP-FPM

Fix Nginx 'upstream connection refused' When Talking to PHP-FPM

You're seeing upstream connection refused in your Nginx error log, and your site...

Fix 'Permission Denied' in VS Code Terminal on Mac

Fix 'Permission Denied' in VS Code Terminal on Mac

You're working in VS Code on a Mac, and when you try to run a command in the integrated termi...

Fix Python Permission Denied When Installing Package in Virtual Environment

Fix Python Permission Denied When Installing Package in Virtual Environment

You activate your Python virtual environment, run pip install somepackage, and get a...

Fix Nginx Configuration Test Failure from Rewrite Rules

Fix Nginx Configuration Test Failure from Rewrite Rules

You run nginx -t and get an error. The log points to a rewrite rule. This is common ...