Knowledge base for software setup, errors, and daily tool work.

Fix Windows Update Component Cleanup Error 0x800f081f

When running Disk Cleanup or the Deployment Imaging Service and Management Tool (DISM) to remove ...

Fix Git SSL Certificate Problem: Unable to Get Local Issuer Certificate

Fix Missing Taskbar Icons on a Second Monitor

If you've connected a second monitor and the taskbar icons aren't showing up on it, you&#...

Fix Nginx Upstream Connection Refused Error

When Nginx returns upstream connection refused in your error logs, it means Nginx tr...

How to Fix Cloudflare Origin Certificate Validation Failed

If you see a "validation failed" error when setting up or using a Cloudflare Origin Certi...

Fix Cloudflare 521 Error on Nginx: Step-by-Step Guide

If you see a Cloudflare 521 error, it means your origin server (the Nginx server behind Cloudflar...