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DNS Firewall

DNS Firewall

DNS Firewall is the leading DNS-based network security solution which effectively contains and controls malware communications and prevents data exfiltration, thereby securing your assets and operations. As a compliment to your border firewall, CEN’s DNS Firewall only takes moments to configure and can save you hours’ worth of aggravation when machines are infected and not blocked from malicious sites.

Included Features:


Employs DNS Response Policy Zones (RPZs) and actionable threat intelligence to prevent data exfiltration.

Simple & Cost Effective

Included in your Internet service at no additional cost. Easy to setup and requires little maintenance.

Comprehensive Protection

Automated malicious domain list maintained by InfoBlox and FireEye.

Always On

Stays current with the evolving threat landscape through automated threat intelligence feeds.

Fault Tolerant Architecture

Highly resilient, purpose-built solution.

Threat Prevention

Dedicated packet inspection for threat mitigation against known bad host names, anti-malware, ransomware, bogon, bot, and cryptocurrency/crypto jacking.

24x7 Premier Support

Backed by CEN’s 24x7x365 Network Operations Center (NOC) who proactively monitors the service and provides unmatched local engineering support.

Use Cases:

  • DNS firewalls deter threats from the inside-out 
  • Compliments border firewalls that protect outside-in threats 
  • Protects against a wide range of DNS threats for an additional layer of protection  
  • Block malicious domains associated with phishing, malware, ransomware, and more 
  • Integrated with CEN’s hosted DNS 


Get Connected


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CEN’s scalable, resilient network design offers an unmatched combination of performance attributes for speed, latency, reliability, and security.

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CEN’s cost recovery model provides competitive pricing, custom tailored services, and larger feature sets as compared to other for-profit ISPs.


CEN's Connecticut based team backs its members with a 24/7/365 Network Operations Center (NOC) and access to senior technical staff for the most consistent, local, expert service available.