Fortinet FortiGate FG-91G Network Security/Firewall Appliance

Experience enterprise-grade security at the edge with the Fortinet FortiGate FG-91G, a converged Next-Generation Firewall (NGFW) and SD-WAN appliance designed for distributed sites and transformed WAN architectures. This compact yet powerful device combines advanced threat protection, flexible connectivity, and streamlined management to deliver secure, reliable network performance across branch offices, retail locations, and small to mid-size data centers. With AI-powered FortiGuard security services and FortiOS optimization, the FG-91G protects your applications and data while simplifying deployment and ongoing operations.

• Converged NGFW and SD-WAN for secure, high-performance branch connectivity. The FG-91G unifies stateful firewalling, application-aware control, VPN, and SD-WAN into a single appliance, reducing the complexity of branch deployments. It enables dynamic path selection based on real-time network conditions, ensuring critical applications stay responsive even when WAN links vary in quality. With hardware acceleration and optimized traffic handling, you get robust threat protection without sacrificing throughput or user experience. The platform supports flexible segmentation (including VLANs and policy-based routing) to isolate, protect, and optimize networks across locations, all while simplifying centralized policy management. This is security-driven networking at scale, tailored for distributed enterprises that demand reliable, cost-efficient connectivity.
• AI-powered FortiGuard security services for proactive protection. FortiGate FG-91G leverages AI/ML-based FortiGuard threat intelligence to stay ahead of evolving threats. Real-time updates cover intrusion prevention (IPS), anti-malware, web filtering, application control, botnet detection, and more, ensuring your defenses adapt to new attack vectors as they appear. SSL inspection capabilities give visibility into encrypted traffic, while granular security profiles allow you to tune protections for different user groups and offices. This dynamic protection is further enhanced by security fabric integration, enabling coordinated responses across Fortinet products and simplifying policy enforcement across the network.
• Comprehensive security features that protect users, data, and applications. The FG-91G provides layered defense, including firewalling, VPN connectivity (IPsec and SSL), threat intelligence, and robust access controls. Application control helps prioritize business-critical apps while restricting risky or non-work-related traffic. Deep packet inspection, TLS/SSL interception (subject to licensing and policy), and sandboxing options (where available) help detect zero-day exploits and advanced malware. With centralized logging, analytics, and alerting, administrators gain clear visibility into security events and can respond quickly to incidents. The device also supports secure remote access and remote site connectivity, ensuring a consistent security posture across all locations.
• Flexible deployment and scalable performance for growing networks. Designed for data centers and branch deployments, the FG-91G supports multiple WAN connections, mixed fiber/cable/WAN options, and scalable bandwidth strategies through SD-WAN. Its compact 1U form factor fits in standard racks while delivering enterprise-grade security features, making it ideal for distributed enterprises that require dependable performance without oversized hardware. The unit pairs well with Fortinet’s management ecosystem, enabling policy consistency, streamlined firmware updates, and centralized monitoring as your network grows. This flexibility ensures you can adapt to evolving business needs, expand securely, and optimize costs over time.
• Management, visibility, and streamlined operations with Fortinet tools. FortiGate FG-91G is built to work with Fortinet’s secure management suite, including FortiManager and FortiAnalyzer, as well as FortiGate Cloud options. You’ll enjoy intuitive graphical interfaces, CLI access for advanced tuning, and comprehensive dashboards that translate security data into actionable insights. Centralized policy management, role-based access, and automated workflows simplify daily tasks, while integration with the broader Fortinet Security Fabric enables coordinated security responses and consistent enforcement across devices and locations.

Technical Details of Fortinet FortiGate FG-91G

• Product type: Fortinet FortiGate FG-91G Network Security/Firewall Appliance
• Form factor: 1U rack-mountable appliance designed for data centers and branch offices
• Operating system: FortiOS with integrated NGFW, SD-WAN, VPN, and security features
• Security services: AI-powered FortiGuard security services including IPS, antivirus, web filtering, application control, and SSL inspection
• Connectivity: Multi-interface Ethernet with WAN/LAN segmentation options to support flexible deployment models
• Management: Centralized management through FortiManager and FortiAnalyzer integration; supports on-device analytics and FortiGate Cloud options

How to Install Fortinet FortiGate FG-91G

• Plan your deployment by outlining WAN links, internal networks, VLANs, and security policies before powering on the FG-91G to ensure a smooth setup.
• Connect the device to power and a management workstation, then access the default management interface or console to set a strong administrator password and perform the initial FortiOS update.
• Configure networking by defining WAN interfaces and LAN networks, enabling SD-WAN rules, and setting up routing as needed. Establish VPN tunnels and ensure policy-based routing aligns with business priorities.
• Enable security services by registering FortiGuard subscriptions, enabling IPS, antivirus, web filtering, SSL inspection, and application control. Tune threat protection profiles to balance security with performance for your environment.
• Finalize the deployment with policy tuning, enabling logging and monitoring, and integrating FortiManager/ FortiAnalyzer for centralized management. Verify connectivity, test failover between WAN links, and assess performance to ensure the solution meets your SLAs.

Frequently asked questions

• What is Fortinet FortiGate FG-91G best for? The FG-91G is ideal for distributed enterprises that need a converged NGFW and SD-WAN at branch sites, delivering strong threat protection, optimized application delivery, and simplified management in a compact, scalable footprint.
• Does FG-91G support SD-WAN? Yes. SD-WAN capabilities are integrated to optimize connectivity across multiple WAN links, improve application performance, and provide resilient failover for critical services.
• Can FG-91G inspect encrypted traffic? FortiGate FG-91G supports SSL/TLS inspection to apply security policies to encrypted traffic, subject to licensing, hardware capabilities, and privacy/compliance considerations.
• How is FG-91G managed? It can be managed locally via the FortiGate graphical user interface (GUI) or CLI, and can be managed centrally using FortiManager and FortiAnalyzer, including cloud-based management options for distributed environments.
• What makes FG-91G different from traditional firewalls? The FG-91G combines NGFW features with SD-WAN, AI-driven FortiGuard security services, application control, and integrated security fabric capabilities, delivering unified security, networking, and management in a single device designed for scalable, security-driven networking across multiple sites.