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

Fix Windows Defender Blocked by Third-Party Antivirus

You open Windows Security and see a yellow warning: "Real-time protection is off. Your device...

Fix Nginx 502 Bad Gateway: Upstream Connection Refused

If you're seeing a 502 Bad Gateway error with "upstream connection refused" in your N...

Fix Git SSL Certificate Problem: Unable to Get Local Issuer Certificate

Fix Python Memory Error When Loading Large JSON Files

If you've tried to load a large JSON file into Python and hit a MemoryError, you...

How to Fix Firefox Secure Connection Failed with VPN

You're using a VPN and Firefox suddenly shows 'Secure Connection Failed' on sites tha...