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

ERR_NAME_NOT_RESOLVED on Chrome for Mac: How to Fix

If you see ERR_NAME_NOT_RESOLVED in Chrome on your Mac, the browser can't transl...

Cloudflare DNS Not Updating After Change: Fixes That Work

You change a DNS record in Cloudflare, wait, and the old IP still resolves. This is a common frus...

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 'Python Command Not Found' in Anaconda on Windows

Git Push Large File Timeout Error: Fixes and Workarounds

You're trying to push a commit that includes a large file—maybe a dataset, a binary, or a gen...

Fixing Nginx Upstream Connection Refused on Port 443

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