Apply least-privilege and defense-in-depth principles. Harden servers, TLS, security headers, WAF and backups. Continuously validate with scripts and configurations.
A freshly bought server is like a house with no locks: default passwords, open ports, and enabled root login are all entry points for attackers. This guide walks through six steps — updating the system, hardening SSH, firewalls, least privilege, logging, and backups — with a checklist a beginner can follow directly.
"Is my server secure?" Feelings are not evidence — scanning is. This guide explains what vulnerability scanning is, what port/service/dependency scans each check, how to use tools like Nmap, OpenVAS, and Trivy, and how to use CVSS scores to decide which vulnerability to fix first, with an intro workflow and frequency advice.
From Nessus, OpenVAS, and Trivy to CVE prioritization, the CISA Known Exploited Vulnerabilities catalog, and patch SLAs - a sustainable vulnerability remediation loop.
A practical SSH hardening guide covering key-based authentication, disabling password login, tightening algorithms, and deploying Fail2ban to reduce brute-force and lateral-movement risk.
From plaintext keys in environment files to Vault's secrets engines, dynamic credentials, short-lived leases, and encryption as a service - a practical secrets rotation roadmap.
A practical guide to the three Linux firewall tools - UFW, iptables, and nftables - covering default policies, common rules, port allow-lists, and brute-force rate limiting.
Key actions and ordering for hardening a Kubernetes cluster: API access control, least-privilege RBAC, Pod Security Standards, runtime isolation, and etcd and secret protection.
A practical incident response lifecycle based on NIST SP 800-61: preparation, detection and analysis, containment/eradication/recovery, and post-incident review, with actionable checklists.
A layered look at data encryption - LUKS disk encryption, database encryption at rest, and TLS in transit - plus key management and backup essentials for a complete protection chain.
An introduction to CIS Benchmarks and their Level 1/Level 2 tiers, common Linux baseline items, and CIS-CAT scanning plus automation steps for systematic hardening and compliance.
Cloudflare integrates Cloudforce One threat intelligence directly into the WAF engine with new cf.intel fields, letting security teams write proactive rules that block high-risk traffic before it reaches their infrastructure.
Cloudflare makes Client-Side Security Advanced available to self-serve users and gives away domain-based threat intelligence. A new GNN-plus-LLM cascade cuts false positives by up to 200x and catches zero-day script attacks.