Checklists for software errors, setup, and tool workflows.

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 Firefox Secure Connection Failed DNS Error

You try to visit a website in Firefox and see 'Secure Connection Failed' with an error li...

Fix DNS Probe Finished NXDOMAIN for a Specific Website

If you see the error "DNS_PROBE_FINISHED_NXDOMAIN" in Chrome when trying to visit a speci...

Fix 'package.json Not Found' After Cloning a Repository

Symptom

You clone a repository from GitHub (or another remote), change into the directory...

Fix ERR_CONNECTION_RESET in Chrome Due to Antivirus

You're browsing normally when Chrome suddenly displays ERR_CONNECTION_RESET....

Fix Windows 11 Installation Assistant Stuck at 99% in Safe Mode

If you're running the Windows 11 Installation Assistant in Safe Mode and it gets stuck at 99%...