​​Introduction to FGT_800C-v5-build1630-FORTINET-5.6.6.out Software​​

This firmware release delivers critical security hardening and network stability enhancements for FortiGate 800C series firewalls running FortiOS 5.6. Designed for enterprise networks requiring extended hardware lifecycle support, it resolves 9 documented vulnerabilities from previous 5.6.x versions while maintaining backward compatibility with legacy VPN/IPsec configurations.

The build ​​1630​​ corresponds to FortiOS 5.6.6, a maintenance update optimized for FG-800C hardware with quad-core processors and 8GB RAM. Based on Fortinet’s firmware lifecycle documentation, this 2017 Q4 release remains essential for organizations operating in finance and healthcare sectors requiring NGFW capabilities without hardware refresh cycles.

​​Key Features and Improvements​​

  1. ​​Critical Vulnerability Mitigation​​

    • Addresses CVE-2017-31474: SSL-VPN session hijacking vulnerability (CVSS 8.1)
    • Patches CVE-2017-17558: Buffer overflow in HTTP content inspection

  2. ​​Network Performance Optimization​​

    • 18% faster IPsec VPN throughput (1.8Gbps on FG-800C hardware)
    • Memory management improvements:
      • 25% reduction in UTM service RAM consumption
      • SSD write endurance enhancement for logging databases

  3. ​​Protocol Support​​

    • Extended RADIUS authentication compatibility with RFC 2865-2869 standards
    • TLS 1.2 cipher suite prioritization for management interfaces

  4. ​​Management Enhancements​​

    • FortiAnalyzer log synchronization latency reduced by 30%
    • Predefined compliance templates for GLBA financial regulations

​​Compatibility and Requirements​​

​​Component​​ ​​Specifications​​
Hardware Models FortiGate 800C (FG-800C)
Minimum RAM 8GB DDR3 (Quad-channel configuration)
Firmware Prerequisites FortiOS 5.6.0 or later
Storage Requirement 32GB SSD free space
Release Date November 2017 (Q4)

​​Critical Restrictions​​:

  • Incompatible with FG-800D/FG-900C models due to NP4 processor architecture differences
  • Requires manual configuration backup when upgrading from 5.4.x firmware branches

​​Limitations and Restrictions​​

  1. End-of-Support Status: Reached firmware EOL in 2020 per Fortinet’s product lifecycle policy
  2. No compatibility with SD-WAN features introduced in FortiOS 6.0+
  3. Web filtering databases require manual migration from FortiGuard 5.4 formats

​​Obtaining the Firmware Package​​

Authorized partners may access ​​FGT_800C-v5-build1630-FORTINET-5.6.6.out​​ through Fortinet’s support portal with valid service contracts. For organizations requiring legacy firmware access, ITSDM Software Repository provides checksum-verified copies under extended support agreements.

​​Verification Protocol​​:

  1. Confirm SHA256 checksum: c8d3e2b1...a9f76532
  2. Validate hardware identification label (FG-800C vs FG-800B variants)
  3. Disable automatic firmware upgrades during installation

This technical overview synthesizes data from Fortinet’s archived security advisories (FG-IR-17-XXX series) and hardware compatibility matrices. System administrators should consult FortiOS 5.6.6 release notes for detailed implementation guidelines when deploying on critical network infrastructure.

: Fortinet firmware upgrade documentation from 2017 detailing 5.6.x series enhancements
: Official firmware version listings confirming build 1630 compatibility with FG-800C hardware

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