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

Fix Cloudflare Wildcard Subdomain and Root Domain Conflict

If you use a wildcard DNS record (e.g., *.example.com) on Cloudflare, you may run in...

Fix Windows Security App Blocked by Antivirus

You open Windows Security (formerly Windows Defender) only to see an error or blank screen becaus...

Fix Nginx 502 Bad Gateway in Docker Containers

An Nginx 502 Bad Gateway error when proxying to a Docker container usually means Nginx cannot rea...

Docker Container Exits Immediately After Entrypoint

You run a Docker container and it stops within seconds. The logs show your entrypoint script ran,...

Handling Python Memory Errors with Large File Chunking