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Sophos Secure Web Gateway

Block threats before any TCP socket opens.

Sophos DNS Protection enforces security at the DNS layer – the lightest, highest-leverage control in the security stack. Block connections to malicious, phishing, and policy-violating domains before the browser, app, or malware ever opens a TCP connection. Roaming agent extends the same policy to off-network users.

Key Capabilities

The cheapest defense layer you’re probably missing

Most malware needs DNS to resolve its command-and-control infrastructure. Most phishing relies on DNS to load the lure page. Block at DNS and you knock out the first step of most attack chains for almost no overhead.

Block at the DNS Layer

Resolution requests for known-malicious domains never return an answer. Browsers, apps, and malware all hit a dead end before any TCP handshake, before any payload, before any inspection.

Roaming Protection

A lightweight agent on each endpoint forwards DNS to Sophos’s resolvers regardless of network. Users get the same blocking policy at home, at the coffee shop, on cellular - everywhere.

Threat Intelligence Feeds

SophosLabs feeds updated continuously with the latest known-bad domains: malware C2, phishing kits, exfiltration endpoints, and active-attack infrastructure.

Category Based Filtering

Block by content category in addition to threat intel. Adult, gambling, file-share, social media, streaming - whatever your acceptable-use policy says, enforce it at DNS.

Custom Allow/ Block List

Override category and intel rules for specific domains. Need to allow a borderline business app, or block a legitimate-looking site you don’t trust? Manage exceptions in Sophos Central.

Query Reporting

See exactly which users, devices, and apps are querying which domains. Spot policy violations, sanctioned-but-noisy apps, and possible compromises that show up as outbound DNS anomalies.
Deep Dive

Why DNS is the highest-leverage control point

A surprising amount of attack tooling depends on DNS at runtime. Block the resolution, you break the tooling. And it’s the only layer where you get this control without inspecting payloads, without decrypting traffic, and without any noticeable overhead.

  • Earliest possible block. The DNS query is the first thing a browser or malware does when it wants to talk to a domain. Block it there and nothing else has to happen.
  • No decryption needed. DNS happens before TLS. You don’t need to decrypt anything to filter on domain reputation - which makes it cheap to deploy and free of privacy concerns.
  • Stops malware C2. Most modern malware uses DNS to look up its command-and-control. Blocking the lookup orphans the malware on the endpoint, where Sophos EDR catches it.
  • Stops phishing too. The phishing URL in the user’s email needs DNS to resolve before the lure page can load. DNS Protection blocks the page from ever rendering.
Who Deploys It

Hard to find an environment that shouldn’t

DNS Protection is one of those products where the question is rarely “should we?” and usually “how fast can we?” These are the three deployments where the value shows up fastest.

 

SMB without firewall-level filtering

Smaller organizations whose firewall doesn’t do URL category filtering or whose Wi-Fi guest network is wide open. DNS Protection adds web-filtering posture without a firewall upgrade.
Web filtering without a firewall change

Roaming User Covergae

You have a firewall doing perimeter filtering, but half your users are at home or on the road. The roaming agent extends the same DNS policy off-network so policy travels with the user.
Same posture, any network

Compliance & Content Filtering

K-12 education, healthcare, public sector, and family-friendly organizations needing content-category enforcement. DNS Protection produces the audit trail those frameworks expect.
Audit-ready content filtering
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