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

Fix Chrome Black Screen During Videos: Hardware Acceleration

If you're watching a video in Chrome and the screen goes black (but audio continues), hardwar...

Fix Nginx Permission Denied for Static Files

Common Causes

When Nginx returns a 403 Forbidden or 'permission denied' error for...

Fix Nginx 502 Bad Gateway on Docker Ubuntu

Fix Git Lock File Not Deleted After Crash

If Git reports a lock file error after a crash, it usually means a previous Git operation was int...

Fixing Nginx Upstream Connection Refused on Port 443

You see "upstream connection refused" in your Nginx error log when proxying requests to p...

Fix Cloudflare DNS Propagation Not Happening for www

You updated DNS records for your www subdomain in Cloudflare, but hours (or days) later, the chan...