FortiGate 400G integrates network security and connectivity through FortiOS. Model selection should consider actual traffic, SSL inspection, FortiGuard services, VPN, high availability and environment growth.
Key features
Published performanceMaximum figures from the official Fortinet matrix for July 2026.
Engineering-based sizingFinal sizing accounts for active services, topology, redundancy and expansion.
Security FabricIntegration with the Fortinet ecosystem according to the defined architecture.
Technical specifications
Interfaces and hardware
Accelerated ports — 2.5/GE RJ45 HA port
1
Accelerated ports — GE RJ45 management port
1
Accelerated ports — 5/2.5/GE RJ45 ports
8
Accelerated ports — GE SFP slots
16
10/GE SFP+/SFP FortiLink slots
4
25/10 GE SFP28/SFP+ slots
4
USB (client / server)
2
Console
1
Local storage
FG-400G: no local data SSD is listed. Variant FG-401G: 2 × 480 GB.
Dedicated TPM
Yes
Bluetooth Low Energy (BLE)
Dash in the datasheet: feature not listed for this SKU
Physical signed-firmware switch
Yes
FortiSentry
Yes
Included transceivers
2x SFP SX
Hardware acceleration
NP7 / CP10
Documented optional DAC cables
10 GE SFP+ active DAC cable, 10m / 32.8 ft (SP-CABLE-ADASFP+); 25 GE SFP28 passive DAC cable (FN-CABLE-SFP28-1); 25 GE SFP28 passive DAC cable (FN-CABLE-SFP28-3); 25 GE SFP28 passive DAC cable (FN-CABLE-SFP28-5); 10 GE SFP+ passive DAC cable 1m (FN-CABLE-SFP+1); 10 GE SFP+ passive DAC cable 3m (FN-CABLE-SFP+3); 10 GE SFP+ passive DAC cable 5m (FN-CABLE-SFP+5); 100 GE QSFP28 breakout to 4x 25 GE SFP28 passive (FN-CABLE-QSFP28-4SFP28-1); 100 GE QSFP28 breakout to 4x 25 GE SFP28 passive (FN-CABLE-QSFP28-4SFP28-3); 100 GE QSFP28 breakout to 4x 25 GE SFP28 passive (FN-CABLE-QSFP28-4SFP28-5)
PoE, Wi-Fi and cellular connectivity
PoE output, a Wi-Fi radio and a 5G cellular modem are not listed for this SKU in the datasheet consulted.
Performance
IPS
25 GbpsEnterprise Traffic Mix; logging enabled. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to).
NGFW
14 GbpsEnterprise Traffic Mix; firewall, IPS and Application Control enabled; logging enabled. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to).
Threat Protection
13 GbpsEnterprise Traffic Mix; firewall, IPS, Application Control and Malware Protection enabled; logging enabled. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to).
Firewall IPv4 — UDP 1518/512/64 bytes
164 / 164 / 145 GbpsLaboratory results; actual performance varies with configuration and traffic. UDP packets of the sizes specified in the metric.
Firewall IPv6 — UDP 1518/512/86 bytes
164 / 164 / 145 GbpsLaboratory results; actual performance varies with configuration and traffic. UDP packets of the sizes specified in the metric.
Firewall latency — UDP 64 bytes
2.51 μsLaboratory results; actual performance varies with configuration and traffic. UDP packets of the sizes specified in the metric.
Packet forwarding
217.5 MppsLaboratory results; actual performance varies with configuration and traffic.
IPsec VPN — throughput (512 bytes)
55 Gbps512-byte packets; AES256-SHA256 encryption. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to).
SSL-VPN — historical throughput
6,1 GbpsPublished historical capacity; SSL-VPN tunnel mode was removed from all models as of FortiOS 7.6.3 and replaced by IPsec VPN. SSL inspection is a separate function.
SSL inspection — throughput
11,5 GbpsIPS; average across HTTPS sessions with different cipher suites. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to).
SSL inspection — new connections/s
9700IPS; average across HTTPS sessions with different cipher suites. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to).
SSL inspection — concurrent sessions
3 millionIPS; average across HTTPS sessions with different cipher suites. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to).
Application control — HTTP 64 KB
50 GbpsHTTP 64 KB; logging enabled. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to).
CAPWAP — throughput (HTTP 64 KB)
131 GbpsHTTP 64 KB. Manufacturer laboratory results; actual performance varies with configuration and traffic. Throughput is advertised as a maximum (up to).
5000Published historical capacity; SSL-VPN tunnel mode was removed from all models as of FortiOS 7.6.3 and replaced by IPsec VPN. SSL inspection is a separate function.
VDOMs — default / maximum
10 / 50
Managed FortiSwitches — maximum
96
Managed FortiAPs — total / tunnel
512 / 256
FortiTokens — maximum
5000
High availability
Active-Active, Active-Passive, Clustering
Installation and power
Dimensions (H × W × D), inches
1.75 x 17.0 x 13.5
Dimensions (H × W × D), mm
44.45 x 432 x 342
Weight
7.72 lbs (3.5 kg)
Form factor and mounting
Rack, 1RU
AC power supply
100–240VAC, 50/60 Hz
Maximum AC current
6A@100VAC
Power consumption — average / maximum
230 W / 283 W
Heat dissipation
965 BTU/h
Redundant power supplies
Yes (two fixed factory-installed AC power supplies for 1+1 redundancy)
Operating temperature
32°F to 113°F (0°C to 45°C)
Storage temperature
-31°F to 158°F (-35°C to 70°C)
Humidity
10% to 90%, non-condensing
Noise
59 dBA
Airflow
Side/front-to-rear airflow
Operating altitude
Up to 10 000 ft (3048 m)
Compliance
FCC Part 15 Class A, RCM, VCCI, CE, UL/cUL, CB
Certifications
USGv6/IPv6
Licensing and lifecycle
FortiGuard licensing and support
FortiGuard services and FortiCare support depend on the purchased bundle or subscription; hardware alone does not imply that all services are included.
SSL-VPN and FortiOS version
Published historical capacity; SSL-VPN tunnel mode was removed from all models as of FortiOS 7.6.3 and replaced by IPsec VPN. SSL inspection is a separate function.
Lifecycle and document review
End of Order / End of Support are not stated in this datasheet; confirm the official milestones for each SKU before purchasing.
Figures published by the manufacturer. Final sizing depends on the environment, enabled services and traffic profile.
