Checklists for software errors, setup, and tool workflows.

Windows 11 Blue Screen After Cumulative Update: Fixes That Work

After installing a cumulative update, some Windows 11 users encounter a blue screen error (BSOD) ...

Docker Nginx 502 Bad Gateway: Memory Limit Fix

You're running Nginx in Docker as a reverse proxy, and suddenly you see 502 Bad Gateway error...

How to Fix Nginx Redirect Loop 302 Errors

You're seeing a 302 redirect loop in Nginx — the browser keeps bouncing between URLs until it...

How to Fix Firefox Secure Connection Failed with VPN

You're using a VPN and Firefox suddenly shows 'Secure Connection Failed' on sites tha...

Fix 'git pull failed index.lock file exists' Error

When running git pull, you may see an error like:

fatal: Unable to create &#...

How to Fix Git Detached HEAD Error

You run git status and see "HEAD detached at" followed by a commit hash. Thi...