Checklists for software errors, setup, and tool workflows.

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Fix Nginx 403 Forbidden: Permission Denied Errors

You're trying to access a site served by nginx, but you get a 403 Forbidden ...

Fix Docker Nginx 502 Bad Gateway with MySQL

You have a Dockerized web app behind Nginx, and you're seeing a 502 Bad Gateway error. The ap...

Fix Nginx Config Test 'Permission Denied' Error

Running nginx -t and seeing 'permission denied' can stop you from reloading ...

Fix VSCode Breakpoints Not Hit in launch.json

You set a breakpoint in Visual Studio Code, start debugging with a launch.json confi...

Fix Firefox Secure Connection Failed Due to Cache

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

Cloudflare DNS Not Updating After Change: Fixes That Work
You change a DNS record in Cloudflare, wait, and the old IP still resolves. This is a common frus...