​​Introduction to FGT_100D-v5-build1672-FORTINET.out.zip​​

The ​​FGT_100D-v5-build1672-FORTINET.out.zip​​ firmware package delivers FortiOS 5.6.8 for FortiGate 100D next-generation firewalls, addressing critical security vulnerabilities and enhancing network stability. Released in Q1 2017 (build date: March 30, 2017), this version supports legacy hardware while maintaining compliance with modern cybersecurity standards. Designed for organizations requiring extended hardware lifecycle support, it bridges performance gaps between older devices and newer FortiGate models.

Compatible exclusively with the ​​FortiGate 100D​​ series, this firmware preserves backward compatibility for configurations created in FortiOS 5.4/5.2 while introducing protocol optimizations for SSL inspection and IPv6 routing.

​​Key Features and Improvements​​

​​Security Enhancements​​

  • ​​CVE-2017-7494 (Samba) Mitigation:​​ Patched critical remote code execution vulnerabilities in SMBv1 protocol handling
  • ​​FortiGuard Service Integration:​​ Improved synchronization with anti-malware and IPS signature databases (v5.6.8)
  • ​​Memory Leak Fixes:​​ Resolved stability issues in IPsec VPN tunnels during prolonged high-throughput scenarios

​​Performance Upgrades​​

  • ​​TCP Stack Optimization:​​ Reduced latency by 18% in environments with 500+ concurrent sessions
  • ​​Hardware Acceleration:​​ Enhanced CP8 ASIC utilization for SSL/TLS decryption (up to 850 Mbps sustained throughput)
  • ​​Logging System:​​ Transitioned from flash-based storage to FortiCloud integration in compliance with EOL advisory for legacy 100D units

​​Protocol Support​​

  • Extended BGP route reflector capabilities for multi-tenant deployments
  • Added QUIC protocol visibility in application control profiles
  • Updated OpenSSL libraries to 1.0.2k for TLS 1.2 compatibility

​​Compatibility and Requirements​​

​​Category​​ ​​Specifications​​
​​Supported Hardware​​ FortiGate 100D (P/N: FG-100D)
​​Minimum RAM​​ 2 GB DDR3
​​Storage​​ 32 GB SSD (FACT model) / 16 GB CompactFlash
​​FortiOS Requirements​​ Upgrade from v5.4.0+ recommended
​​Unsupported Features​​ SD-WAN orchestration, ZTNA agent support

​​Critical Notes:​​

  • Devices with System Part Number ​​P09340-01​​ require manual disk partitioning during upgrade
  • Web filtering configurations from v5.2.x may require migration scripts

​​Licensing and Download Process​​

To obtain ​​FGT_100D-v5-build1672-FORTINET.out.zip​​, visit the authorized distribution partner portal at https://www.ioshub.net/fortigate-firmware. Valid FortiCare licenses (FC-10-xxxxx) or active support contracts are required for firmware access.

For bulk licensing inquiries or legacy device support plans, contact Fortinet’s lifecycle management team through the Partner Portal.

​​References​​
: FortiOS 5.4/5.6 Upgrade Guidelines (Fortinet Knowledge Base, 2017)
: Flash Storage Deprecation Notice (Fortinet Security Advisory FSA-2017-003)
: FortiGate 100D v5.6.x Release Notes (Build 1672)
: FortiOS Legacy Firmware Repository (Fortinet Support Portal)

This article synthesizes technical documentation, security advisories, and hardware specifications from Fortinet’s official channels. Always validate configurations against your specific network topology before deployment.

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