SonicWall TZ270 vs TZ370: 7 Essential Differences and the Best Pick for Your Office

Last updated: October 3, 2026

SonicWall TZ270 vs TZ370 comes down to inspection headroom and availability. Both are eight-port Gen 7 desktop firewalls, but the TZ370 delivers 1 Gbps of threat prevention against 750 Mbps, and 500 Mbps of TLS inspection against 300 Mbps. The TZ270 also passed SonicWall’s last order day on June 30, 2026.

That last point changes the buying decision more than any throughput figure. Jazz Cyber Shield is a US-based reseller of networking and cybersecurity hardware, and this guide is written from that side of the counter: what the two boxes share, where they differ, and which one belongs in which office.

What is the real difference in SonicWall TZ270 vs TZ370?

The TZ370 is the same chassis with a faster inspection engine and higher limits. It scans about a third more traffic with security services on, tracks more simultaneous connections, and terminates twice as many site-to-site VPN tunnels.

What does not change is the hardware you can see. According to SonicWall’s Gen 7 TZ Series datasheet, both models ship with 8x1GbE interfaces, two USB 3.0 ports and one console port. Both use the same 36W external power supply, both have a storage slot that expands up to 256GB, and both can manage up to 16 SonicWall access points.

The whole SonicWall TZ270 vs TZ370 decision therefore lives in the performance and capacity rows below.

SonicWall TZ270 vs TZ370 specification table

These figures are SonicWall’s published specifications for the Gen 7 TZ series. The headline throughput and connection numbers also appear on SonicWall’s entry-level firewall page.

What are the 7 differences that matter?

Seven rows separate SonicWall TZ270 vs TZ370, and six of them are capacity limits. The seventh is whether you can still order the box.

1. Threat prevention throughput: 750 Mbps against 1 Gbps.
2. DPI-SSL throughput: 300 Mbps against 500 Mbps.
3. IPSec VPN throughput: 750 Mbps against 1.38 Gbps.
4. Connection capacity: 6,000 against 9,000 new connections per second.
5. VPN scale: 50 against 100 site-to-site tunnels.
6. VLAN interfaces: 64 against 128.
7. Lifecycle status: the TZ270 is past its last order day; the TZ370 was not part of that notice.

Can you still buy a TZ270 in late 2026?

Only from remaining channel stock. SonicWall published a Last Time Buy announcement for the TZ270 and TZ470 on June 9, 2026, with the window closing on June 30, 2026. The same notice names the Gen 8 TZ280 as the TZ270’s successor.

The TZ370 does not appear in that announcement. SonicWall’s product lifecycle tables list a last order day of June 30, 2026 for the TZ270 and TZ470, and we found no entry there for the TZ370. The later lifecycle dates for the TZ270 had not been published when we checked for this update.

This is why SonicWall TZ270 vs TZ370 now has a supply side. A sealed TZ270 on a reseller’s shelf is still a new, supportable firewall, but its end-of-life process has started and replacement units will become harder to find.

What do SonicWall’s lifecycle phases mean for a buyer?

A retired model keeps receiving support for years, on a narrowing basis. SonicWall’s product lifecycle policy describes the phases this way:

• Last Day Order (LDO): advance notice that the end-of-life process is starting.
• Active Retirement Mode (ARM): the product is no longer manufactured or sold, but support contracts remain available. The policy sets this phase at two years.
• Limited Retirement Mode (LRM): firmware is limited to critical bugs and security vulnerabilities, for three years.
• End of Support (EOS): no technical support, firmware updates or hardware replacement.

For SonicWall TZ270 vs TZ370, the practical reading is that a TZ270 bought today has a long supported life, but a shorter one than a model still in production. The TZ370 is the same generation, so expect it to follow; SonicWall has not announced a date. You can see what is currently available in our SonicWall firewalls category.

How much firewall throughput does your office need?

Size the firewall on the slowest throughput figure you will actually use, then compare it with your internet circuit. For most offices that is threat prevention throughput; for offices that decrypt traffic it is DPI-SSL throughput. Sizing is where SonicWall TZ270 vs TZ370 is usually decided.

Firewall inspection throughput, 2 Gbps and 3 Gbps on these models, describes stateful inspection only. Switch the security services on and the ceilings become 750 Mbps and 1 Gbps, and those are laboratory figures, so leave headroom.

Why is DPI-SSL throughput the number to size on?

Because most web traffic is encrypted, and a firewall cannot scan what it cannot read. With TLS inspection enabled, SonicWall rates the TZ270 at 300 Mbps and the TZ370 at 500 Mbps.

If your circuit is 500 Mbps and you intend to decrypt and inspect, a TZ270 becomes the bottleneck. In a SonicWall TZ270 vs TZ370 comparison, this single row decides more purchases than any other.

DPI-SSL is not automatic, though. It requires a trusted certificate on every managed device and an exclusion list for applications that break under inspection. If you will not run it, size on threat prevention throughput instead.

How do connection limits affect a busy office?

Connection limits cap how many sessions the firewall can track at once, and encrypted inspection has the tightest cap. The TZ270 tracks up to 25,000 DPI-SSL connections and the TZ370 up to 30,000.

Browsers and cloud applications hold many TLS sessions open per user, so a dense site can reach a connection ceiling before it runs out of bandwidth. On this row SonicWall TZ270 vs TZ370 is closer than the throughput figures suggest, so a crowded site may need a larger model than either.

SonicWall TZ270 vs TZ370: which model fits which office?

Choose the TZ270 class for a single small site on a circuit under roughly 300 Mbps. Choose the TZ370 for faster circuits, more VPN tunnels or any plan to grow.

SonicWall publishes capacities for these firewalls, not recommended headcounts, so we size on circuit speed and inspection plan first and people second. The SonicWall TZ270 vs TZ370 examples below are illustrative sizing exercises, not measured deployments.

If you are also weighing another vendor at this size, our FortiGate 60F vs SonicWall TZ370 comparison covers that side of the decision.

How do VPN and VLAN limits compare?

On both limits SonicWall TZ270 vs TZ370 is a two-to-one contest: 100 site-to-site VPN tunnels against 50, and 128 VLAN interfaces against 64. The TZ370 also carries almost twice the IPSec VPN throughput, at 1.38 Gbps against 750 Mbps.

The TZ270 includes one SSL VPN licence and scales to 50; the TZ370 includes two and scales to 100. Both include five IPSec VPN client licences with a maximum of 200. If you have remote staff, add SSL VPN licences to the quote from the start.

For multi-site businesses, SonicWall states that SD-WAN is built into the Gen 7 TZ series at no additional cost. Its Gen 7 FAQ also confirms that stateful high availability is supported as a separate SKU.

VLAN counts matter when you separate staff, guests, voice, cameras and point-of-sale across several floors or tenants. If that describes your network, the SonicWall TZ270 vs TZ370 choice is already made.

How does licensing work on the TZ270 and TZ370?

Both models use the same three Gen 7 subscription bundles with identical contents, so on licensing SonicWall TZ270 vs TZ370 is a tie. SonicWall’s TZ Gen 7 FAQ defines the bundles as follows:

• Threat Protection Security Suite (TZ270, TZ370 and TZ470 only): Gateway Anti-Virus, Intrusion Prevention and Application Control, Content Filtering Service, Network Visibility and 24×7 Support.
• Essential Protection Security Suite: everything above plus Capture Advanced Threat Protection with RTDMI technology and Comprehensive Anti-Spam Service.
• Advanced Protection Security Suite: the Essential services plus cloud management and cloud-based reporting for seven days.

Our view as a reseller: on either side of SonicWall TZ270 vs TZ370, Essential Protection is the practical floor for a business network, because it is the first tier that includes Capture ATP sandboxing. Advanced Protection earns its place when you manage several firewalls from one cloud console. The older AGSS and CGSS bundles are not supported on Gen 7 TZ models.

Services are activated on the appliance you register in MySonicWall, so if you are offered a used unit, confirm that it can be registered to your own account before you pay. SonicWall’s FAQ also notes that relevant services transfer under its Secure Upgrade Plus program when you move to newer hardware.

Should you skip both and buy a Gen 8 TZ280 or TZ380?

If you are buying new and plan to keep the firewall for five years or longer, look at Gen 8 first. SonicWall lists the TZ280 at 1 Gbps of threat prevention throughput, which matches the TZ370, and the TZ380 at 1.5 Gbps. Here is how the Gen 8 pair sits around SonicWall TZ270 vs TZ370:

The entry Gen 8 model equals the mid Gen 7 model on threat prevention, yet the TZ370 still leads the TZ280 on VPN throughput.

SonicWall also describes the Gen 8 TZ line as offering Wi-Fi 6, 2.5/5 GbE ports and integrated PoE/PoE+ options. The same page describes a Managed Protection Security Suite that includes monitoring, firmware updates, vulnerability reporting and an embedded warranty of up to $200K.

SonicWall’s SonicOS 8.1.0 FAQ lists Gen 8 models for that release at launch, and directs owners of older hardware to its Secure Upgrade Plus or SonicProtect programs.

That does not make SonicWall TZ270 vs TZ370 a dead question. Gen 7 remains the sensible buy when you run a fleet of Gen 7 units on one firmware family, need a like-for-like replacement or a matching unit for a high availability pair, or have an in-stock unit that solves the problem today.

How do you set up a TZ270 or TZ370 out of the box?

Setup is one area where SonicWall TZ270 vs TZ370 makes no difference. SonicWall’s SonicOS 7 TZ getting started guide offers four routes: local management, the SonicExpress mobile app, Zero-Touch Deployment, and cloud management through Network Security Manager.

For a single office, local management is simplest:

1. Register the appliance in MySonicWall. Every setup route depends on it.
2. Connect a computer to X0, the LAN interface, and browse to https://192.168.168.168.
3. Log in with the documented default credentials (admin and password) and change them immediately.
4. Connect your internet circuit to X1 and configure the WAN addressing from your provider.
5. Update the firmware before the firewall carries production traffic.
6. Synchronize licences and switch on each security service in your bundle.
7. Build your zones and VLANs, add VPN policies and export a settings backup.

The SonicExpress app runs on iOS and Android but needs a USB cable that is not supplied with the firewall. Cloud management requires a Network Security Manager licence, and the Advanced Protection bundle is the tier that includes cloud management.

What mistakes do buyers make with SonicWall TZ270 vs TZ370?

The common mistakes are sizing on the wrong throughput row, ignoring tunnel limits, and treating the subscription as optional. Most SonicWall TZ270 vs TZ370 regrets trace back to one of these.

• Sizing on firewall inspection throughput. The 2 Gbps and 3 Gbps figures describe a mode you will not run. Use threat prevention or DPI-SSL throughput.
• Comparing hardware prices alone. The subscription delivers the anti-virus, intrusion prevention and sandboxing, so compare hardware and term together.
• Expecting the wireless variant to cover the whole office. The TZ270W and TZ370W carry an 802.11ac Wave 2 radio, which suits a small suite. Larger floors need dedicated business wireless access points.
• Forgetting power. SonicWall’s FAQ confirms the TZ270, TZ370 and TZ470 do not include redundant power supplies, so put the firewall on a UPS.

SonicWall TZ270 vs TZ370: frequently asked questions

SonicWall TZ270 vs TZ370: which is faster?

The TZ370 is faster. SonicWall rates it at 3 Gbps firewall inspection and 1 Gbps threat prevention throughput, against 2 Gbps and 750 Mbps for the TZ270. With TLS inspection enabled, the ratings are 500 Mbps and 300 Mbps.

Is the SonicWall TZ270 discontinued?

The TZ270 reached its last order day on June 30, 2026, according to a SonicWall notice published June 9, 2026. It remains supported under SonicWall’s lifecycle policy, and remaining units are sold from channel stock.

How many VPN tunnels do the TZ270 and TZ370 support?

The TZ270 supports 50 site-to-site VPN tunnels and the TZ370 supports 100. For remote users, the TZ270 scales to 50 SSL VPN licences and the TZ370 to 100, with one and two licences included.

Do the TZ270 and TZ370 use the same licences?

They use the same three Gen 7 bundles: Threat Protection, Essential Protection and Advanced Protection. The services in each bundle are the same on both models. If you are moving from one model to the other, ask about SonicWall’s Secure Upgrade Plus program before you renew.

What replaces the SonicWall TZ270?

SonicWall names the Gen 8 TZ280 as the successor to the TZ270. The TZ280 is listed at 2.5 Gbps firewall inspection and 1 Gbps threat prevention throughput, which matches the TZ370 on threat prevention.

Can the TZ270 or TZ370 handle a gigabit internet connection?

The TZ370 can pass 1 Gbps with threat prevention enabled, while the TZ270 is rated at 750 Mbps. Neither reaches gigabit speed with TLS inspection on, so full DPI-SSL on a gigabit circuit needs a larger model.

Where can you buy the right SonicWall TZ firewall?

You can compare current models in the SonicWall firewall range at Jazz Cyber Shield. If your shortlist is still open, our wider business firewalls category covers other vendors at the same size, and our SonicWall vs FortiGate guide explains how the two platforms differ.

The short version of SonicWall TZ270 vs TZ370 is this. Buy the TZ370 when the circuit is fast, the tunnel count is growing or you want headroom. Accept a TZ270 when the site is small and the price is right. Look at the TZ280 when you are starting fresh.

Sources

• SonicWall, TZ Series entry-level firewalls and TZ Series (Gen 7) datasheet
• SonicWall, Last Time Buy Announcement: TZ 270 and TZ 470 (June 9, 2026)
• SonicWall, Product Life Cycle Tables and lifecycle policy
• SonicWall, FAQ TZ Gen 7 and SonicOS 8.1.0 FAQ
• SonicWall, SonicOS 7 TZ Series Getting Started Guide