Why this checklist matters

Security issues that cause the biggest damage are often the simplest ones:

• Publicly exposed admin ports (SSH/Redis/etc.)
• Weak TLS configuration
• Missing security headers
• No monitoring or alerting

Quick checks

1) Close dangerous ports

If a service must be reachable, restrict it by IP and require strong auth.

# Example: block Redis from the public internet
sudo ufw deny 6379
sudo ufw reload

2) Enforce HTTPS

Always redirect HTTP → HTTPS and enable HSTS.

3) Add essential security headers

Minimum recommended:

What to do next

Run a scan, fix critical/high issues first, then iterate.