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

How to Fix Cloudflare 521 Error During Setup

If you see a 521 error after setting up Cloudflare, it means your origin server refused the conne...

Fix Nginx 502 Bad Gateway Docker Permission Denied

When running Nginx as a reverse proxy in a Docker environment, a 502 Bad Gateway error often poin...

Chrome Sync Not Working with VPN: Fixes and Checks

If Chrome sync stops working after you turn on a VPN, you're not alone. The VPN can interfere...

Cloudflare Origin Certificate Setup for Apache

If you use Cloudflare's proxy (orange cloud), you can set up an origin certificate to encrypt...

How to Fix Chrome Sync Not Working with Multiple Profiles

If you use multiple Chrome profiles—say, one for work and one for personal—sync can sometimes sto...

Fix Nginx Upstream Connection Refused Socket Error