Checklists for software errors, setup, and tool workflows.

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Fix Nginx Upstream Connection Refused Socket Error

When Nginx returns a 502 Bad Gateway or logs upstream connection refused

Fix DNS Probe Finished NXDOMAIN on Google DNS Setup
If you see "DNS probe finished NXDOMAIN" in your browser, it means your device couldn'...

Docker Compose Ports Not Working: Common Fixes
You've defined ports in your docker-compose.yml, but containers aren't reachable on the e...

How to Re-enable IntelliSense in VS Code When It's Disabled
If IntelliSense suddenly stops working in Visual Studio Code—no suggestions pop up as you type, o...

Fix ERR_CERT_AUTHORITY_INVALID on Localhost
When testing a local web app, you may see ERR_CERT_AUTHORITY_INVALID in Chrome or si...

Fix Docker Compose Port Already Allocated for PostgreSQL
You run docker-compose up and see an error like "Error starting userland pro...

Checklists for software errors, setup, and tool workflows.

Latest checklists

Fix Nginx Upstream Connection Refused Socket Error

Fix DNS Probe Finished NXDOMAIN on Google DNS Setup

Docker Compose Ports Not Working: Common Fixes

How to Re-enable IntelliSense in VS Code When It's Disabled

Fix ERR_CERT_AUTHORITY_INVALID on Localhost

Fix Docker Compose Port Already Allocated for PostgreSQL

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