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

Fix NET::ERR_CERT_AUTHORITY_INVALID in Chrome

When Chrome shows 'NET::ERR_CERT_AUTHORITY_INVALID', it means the browser cannot verify t...

Python Requests Timeout Not Working: Fixes & Checks

You set a timeout in requests.get(url, timeout=5), but the request hangs for minutes...

Nginx Upstream Connection Refused: Fixing localhost Errors

You set up an nginx reverse proxy to forward requests to a backend service on localhost, but ngin...

Fix Python Permission Denied When Installing Package in Virtual Environment

You activate your Python virtual environment, run pip install somepackage, and get a...

Checklist for Troubleshooting Nginx Permission Denied Errors

Understanding the Problem

When Nginx returns a 403 Forbidden or logs an error like ...