New Fastest Firebox Firewall Models Ever M4850 M5850 and M6850

Speedster IT’s guide to WatchGuard’s new High Rackmount Firebox family.

Most networks have quietly outgrown their firewalls. Encrypted traffic now makes up the vast majority of business internet use, session counts climb every time another SaaS app or AI tool gets adopted, and bandwidth-hungry applications keep pushing bandwidth requirements upward.

None of this is dramatic on its own. But together, it exposes the limits of older firewall platforms faster than most IT teams expect.

WatchGuard’s new Firebox High Rackmount family, the M4850, M5850 and M6850, is built to close that gap.

As a WatchGuard Gold Partner, we think this is one of the more significant hardware releases WatchGuard has made in years, and it matters for any organisation running a large mid-market, campus, or data centre edge network.

Why Networks Are Outgrowing Older Firewalls

Encrypted Traffic Is Eating Firewall Performance

Inspecting encrypted traffic is far more resource-intensive than inspecting traffic in the clear.

As encryption has become the default across every application, older firewall appliances have had to work harder just to maintain the same throughput. That extra load shows up as latency, dropped connections, or a security team quietly disabling services to protect performance.

Session Counts and Bandwidth Are Rising Fast

Every new device, cloud application and remote worker adds to the number of simultaneous sessions a firewall must track.

At the same time, the shift to 25G and 100G networking in campus and data centre environments means the appliance sitting at the edge must keep pace with connections it was never sized for.

For a lot of organisations, that mismatch is the real trigger behind an uncomfortable, and expensive, conversation about enterprise-grade alternatives.

Introducing the Firebox M4850, M5850 and M6850

WatchGuard’s new High Rackmount Firebox family is built specifically to remove that trade-off.

It gives partners a faster, simpler path into large mid-market, campus, and data centre edge opportunities, without pushing customers towards platforms that are too complex, too costly, or too slow to deploy.

  • Three performance tiers — the M4850, M5850 and M6850 — so the right level of throughput can be matched to the environment.
  • Native 25G and 100G connectivity built in as standard, rather than bolted on.
  • An industry-first OCP 3.0 expansion bay, the first time this standard has been built into a firewall platform, future-proofing the appliance for next-generation networking.
  • Redundant power supplies and hot-swappable fans as standard, for the uptime that campus and data centre deployments demand.
  • Centralised management through WatchGuard’s Unified Security Platform, keeping network, identity, and endpoint security in one place.

This is not an incremental refresh.

It is a genuinely new performance tier for the Firebox line, aimed squarely at the customers who have already outgrown WatchGuard’s mid-range appliances but do not need, or want, the cost and complexity of a traditional enterprise firewall.

Positioning Against Fortinet, SonicWall and Palo Alto

Why This Shouldn’t Turn into a Spec War

It is tempting to compare these appliances line by line against Fortinet, SonicWall and Palo Alto. We would argue that is the wrong conversation to have.

The real question for most customers is not which vendor wins on a single benchmark. It is which platform delivers real-world price-performance with every security service switched on, and which one can be deployed and managed without adding a full-time headcount.

Real-World Performance, Not Benchmark Performance/h3>

WatchGuard’s rackmount appliances are tested with all services active, rather than stripped down to hit a headline number.

That matters because customers do not run their firewalls with security switched off. For partners, this is a far stronger conversation than a spec sheet: consistent, predictable performance under the conditions the customer will operate in.

Identifying the Right Opportunities First

Before any positioning conversation happens, it is worth looking properly at where the opportunity sits, both in an existing installed base and in competitive accounts.

A customer running an older mid-range Firebox that has hit its ceiling is a vastly different conversation to one running a Fortinet or Palo Alto box that’s overkill, and overpriced, for what they need.

Getting that distinction right upfront avoids a spec war entirely because the conversation becomes about fit rather than features.

Trade-Up SKUs and Bundled Total Security

For existing WatchGuard customers, Trade-Up SKUs offer a clear route onto the new platform without a forklift upgrade or a licensing surprise halfway through the deal.

Combined with bundled Total Security, pricing stays predictable for both the partner and the customer, which tends to shorten deal cycles rather than stretch them out.

For competitive accounts running Fortinet, SonicWall or Palo Alto, the pitch is similar: enterprise-grade performance and resiliency, without the licensing complexity those platforms are often criticised for.

How Speedster IT Helps You Scale

As a WatchGuard Gold Partner, we help clients identify where an existing firewall has genuinely been outgrown, rather than assuming every renewal needs a bigger box.

That usually means looking at actual session counts, encrypted traffic volumes, and bandwidth trends, not just the age of the appliance.

Where a High Rackmount Firebox is the right fit, we handle sizing, licensing and deployment as part of the wider security stack we already manage.

That means scaling up a firewall doesn’t mean introducing a new vendor, a new management console, or a new set of risks to your Cyber Essentials Plus posture.

WatchGuard is trusted by more than 25,000 MSPs protecting over 1.5 million customers worldwide, and that scale matters when it comes to firmware maturity, support response times, and the pace of future updates.

We have backed the platform for exactly that reason, and the new High Rackmount family extends it further into the mid-market and campus deployments our clients are increasingly asking us to support.

Get in Touch – 0204 511 9111

If your network has started to feel the strain—encrypted traffic slowing things down, session counts climbing, or bandwidth demands outpacing your current firewall—it is worth finding out whether the M4850, M5850 or M6850 is the right fit before your next renewal forces the decision.

Contact our team to talk it through:
Phone: tel:02045119111
Email: speedster-it.com”>sales@speedster-it.com

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