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

Fix Cloudflare Origin Certificate with Let's Encrypt

If your origin server is rejecting the Cloudflare origin certificate—perhaps because of a SAN mis...

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 Nginx Redirect Loop After SSL Certificate Install

You installed an SSL certificate, and now your site redirects in a loop. The browser shows 'E...

Fix Docker Volume Permission Denied for Postgres

Fix VS Code Terminal Not Opening with Node

You open VS Code, try to start the integrated terminal, and it either doesn't appear, flashes...

Git Merge Unrelated Histories Without Losing Commits

You've cloned a repo, added a new remote, and now you need to merge two branches that don'...