Checklists for software errors, setup, and tool workflows.

Fix ERR_CERT_AUTHORITY_INVALID on Localhost

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

How to Fix Windows Update Error 0x800f081f

Error 0x800f081f usually appears when Windows Update tries to install a feature update or a cumul...

Fix Nginx 502 Bad Gateway: Upstream Connection Refused

If you're seeing a 502 Bad Gateway error with "upstream connection refused" in your N...

Fix 'Permission Denied' in VS Code When File Isn't Read-Only

You're editing a file in VS Code and get a 'Permission denied' error when saving, eve...

Docker Network Not Found After Container Restart: Fixes

You restart a Docker container and get an error like network <name> not found....

How to Fix Git Merge Unrelated Histories Error

You run git pull or git merge and get:

fatal: refusing to...