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Cloudflare’s Web Application Firewall is one of the most effective layers of defence available for web applications — and also one of the most frequently misconfigured. Hellenic Technologies configures WAF policies that block real attacks without generating false positives that break legitimate functionality. We start with Cloudflare’s managed OWASP ruleset in Log mode, analyse traffic patterns, then progressively enable rules in Block mode once we understand the application’s traffic profile. Custom WAF rules handle application-specific threats. We write Wireshark-style filter expressions to block requests by IP reputation, ASN, country, user agent, URI pattern, or request body content. Rate limiting rules throttle brute-force login attempts, credential stuffing attacks, and API abuse — configured per endpoint with appropriate thresholds that protect against attacks without affecting legitimate high-volume usage. Bot Management (available on Business and Enterprise plans) distinguishes between verified bots (Googlebot, Bingbot), unverified bots, and humans. We configure Bot Fight Mode for simpler use cases and full Bot Management for applications where bot traffic analysis and scoring are needed. Combined with Cloudflare Turnstile (their CAPTCHA replacement), login and form pages get bot protection without degrading user experience. WAF management services include:
  • OWASP managed ruleset deployment with false-positive analysis and tuning
  • Cloudflare managed rulesets for WordPress, Drupal, and common frameworks
  • Custom WAF rules for application-specific attack patterns
  • Rate limiting rules for login endpoints, APIs, and form submissions
  • IP Access Rules and blocklists for known malicious networks
  • Bot Management configuration and verified bot allowlisting
  • Turnstile CAPTCHA integration for login and registration pages
  • WAF Analytics review and monthly rule tuning reports
  • Security event alerting via webhooks or PagerDuty integration