Compare Access Gate and Nozomi Networks.
Nozomi Networks gives you OT visibility. Access Gate gives you visibility and enforcement: monitoring and Zero Trust access control in one on-premises appliance.
Monitoring alone does not stop access.
OT monitoring tools tell you what happens on your network: which devices talk, which protocols they use and where anomalies appear. Monitoring alone does not stop unauthorized access, prevent lateral movement or enforce segmentation. To act on what you see, you need enforcement.
Monitoring and enforcement in one appliance.
Access Gate connects to your existing network. It discovers the machines on it, then enforces segmentation, access policies and remote session controls from a single on-premise appliance. No cloud, no agents needed.
Passive OT monitoring and threat detection.
Nozomi Networks specializes in passive network monitoring for OT environments. Its Guardian sensors provide deep protocol analysis, asset discovery, and threat detection. Enforcement relies on integration with third-party firewalls and NAC platforms.
| Feature | Access Gate | Nozomi Networks |
|---|---|---|
| Deploys without re-cabling or re-addressing | Assets keep their IP, gateway and VLAN; inserted with a routing or DNS change | SPAN or TAP per monitored segment |
| Asset discovery | ||
| OT threat detection | Snort rules, curated alert library, risk matrix | Deep protocol analysis |
| Network segmentation | Monitoring only | |
| Access control | ||
| Secure remote access | ||
| OT protocol inspection | ||
| SIEM integration | ||
| Cloud dependency | Fully on-premise | Cloud option available |
| Deployment mode | Connects to your existing network, discovers and enforces | Passive only |
| Compliance automation | Reporting-focused |
Access Gate monitors and enforces.
Nozomi Networks is a leader in passive OT monitoring and threat detection. Access Gate adds what Nozomi does not: enforcement, segmentation, and zero-trust access control. You get visibility and the ability to act on it from the same appliance.
Access Gate connects without rewiring.
Access Gate connects to your existing network without rewiring. It watches traffic passively during discovery, then you steer the flows you want protected through it, one at a time, without adding hardware.
One appliance does the whole job.
Access Gate consolidates monitoring, segmentation, remote access, and access control into one on-premise appliance. With Nozomi, enforcement requires integrating separate products such as firewalls or NAC systems.
Questions about Access Gate and Nozomi Networks.
appliance to monitor and enforce, connected to your existing network.
Choose Access Gate when you need to go beyond monitoring. If you want to segment OT networks, enforce access policies and control remote sessions from one appliance with no cloud, Access Gate fits.
Nozomi Networks is a strong choice when deep passive monitoring, advanced threat detection, and broad OT protocol coverage are your top priorities. It is well-suited for environments where enforcement is already handled by existing firewalls or NAC solutions.
Yes. Some teams deploy Nozomi for its deep threat intelligence and protocol analysis alongside Access Gate for enforcement and segmentation. The two products cover different parts of the OT security stack and integrate through standard syslog and SIEM workflows.
Access Gate uses a single-appliance pricing model that includes monitoring, segmentation, access control, and remote access. Nozomi typically prices per sensor and may require additional licenses for advanced analytics or cloud management features.
Also looking at cloud security tools?
If SASE and cloud-delivered Zero Trust are also on your shortlist, our Zscaler competitors and alternatives for OT comparison sets Zscaler, Palo Alto Prisma Access, Netskope and Cloudflare side by side against the constraint that decides it on a plant floor: PLCs and HMIs that will never run an agent.
Not sure which systems to protect first? Start with how to perform a risk assessment on your OT environment, which covers asset discovery and consequence rating without active scans.