Practical software fixes, setup guides, and tool workflows.

How to Fix Nginx Upstream Connection Refused on Port 80

When nginx logs show "upstream connection refused" while connecting to port 80, it means ...

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

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

fatal: Unable to create &#...

                            

Fix Windows 11 Installation Assistant Stuck at 99% Due to Network Issues

You're running the Windows 11 Installation Assistant, it downloads happily up to 99%, then si...

Fixing Cloudflare Wildcard Subdomain Proxy Errors

If you've set up a wildcard DNS record (e.g., *.example.com) in Cloudflare and a...

Fix Windows Security App Missing from Start Menu

You open the Start menu, type “Windows Security,” but nothing appears. The app may have been unre...

Fix Nginx 'Permission Denied' Upstream Errors

When Nginx logs permission denied while connecting to an upstream (e.g., a Unix sock...