Checklists for software errors, setup, and tool workflows.

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Docker Compose Port Already Allocated: Checklist

You run docker-compose up and get an error like Error starting userland proxy:...

Fix Git Push Non-Fast-Forward and Permission Denied Errors
When you run git push and get an error like ! [rejected] main -> main (non-...

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...

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...

Fixing Nginx Upstream Connection Refused and Permission Denied
If you see connect() failed (111: Connection refused) or connect() failed (13:...

Fix ERR_CONNECTION_RESET Caused by Chrome Extensions
If Chrome suddenly shows ERR_CONNECTION_RESET on sites that used to work, a misb...

Checklists for software errors, setup, and tool workflows.

Latest checklists

Docker Compose Port Already Allocated: Checklist

Fix Git Push Non-Fast-Forward and Permission Denied Errors

Fix Docker Nginx 502 Bad Gateway with MySQL

Cloudflare DNS Not Updating After Change: Fixes That Work

Fixing Nginx Upstream Connection Refused and Permission Denied

Fix ERR_CONNECTION_RESET Caused by Chrome Extensions

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