Sophos Firewall: DNS enhancements

Oct 19, 2026

Sophos Firewall v23 brings new DNS enhancements including DNS-over-HTTPS (DoH) support, DNS security extension (DNSSEC) support, and one-click Secure DNS set up, made possible through native integration with Sophos Fusion. Learn about the new enhancements and the steps to set up Secure DNS Protection, third-party DNS services, and DNSSEC protection.

  • Captions are generated by machine translation and may contain errors**
  • Video Chapters*

00:00 Intro

00:13 DNS enhancements

01:08 Overview

01:36 Prerequisites

01:52 DoH protocol

02:15 Secure DNS overview

03:00 One-click Secure DNS flow

03:46 Set up Secure DNS

04:37 Configure filtering policy

05:13 DNS lookup

06:32 Migration behavior

07:49 Third-party DNS resolver

08:13 Set up third-party DNS

09:05 DNS resolution fall back

09:36 Test domain resolution

09:57 DNSSEC overview

10:17 DNSSEC validation

11:23 Set up DNSSEC

11:59 Test DNSSEC

12:19 Outro

  • Relevant Documentation*

📖 Product documentation - DNS
https://docs.sophos.com/nsg/sophos-firewall/23.0/Help/en-us/webhelp/onlinehelp/index.html

📖 Product documentation - Administrator help
https://docs.sophos.com/nsg/sophos-firewall/23.0/Help/en-us/webhelp/onlinehelp/index.html

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