Product Overview

This firmware update delivers critical security hardening and network protocol enhancements for FortiGate 201E next-generation firewalls deployed in enterprise branch networks. As part of FortiOS 5.6’s extended support cycle, build 1700 addresses 18 documented vulnerabilities while maintaining compatibility with legacy security infrastructure. The update targets 2015-2018 production batches of FortiGate 201E appliances with NP4 network processors.

Core Security & Performance Upgrades

  1. ​​Vulnerability Remediation​​
    Resolves CVE-2017-31472 (SSL VPN session hijacking) and CVE-2017-7925 (web interface XSS flaw), addressing PCI DSS 3.2 compliance requirements for financial institutions.

  2. ​​Network Optimization​​

  • 30% throughput improvement for IPsec VPN tunnels
  • Enhanced TCP fast retransmission algorithms
  • Extended RADIUS accounting protocol support
  1. ​​Management System Improvements​​
  • Web interface session timeout increased to 45 minutes
  • CLI configuration backup compression efficiency gains
  • SNMP v2c trap generation stability fixes

Compatibility Matrix

Hardware Model Minimum OS Version Release Date
FortiGate 201E (FG-201E) FortiOS 5.6.9 Q4 2016
FortiGate 201E-POE FortiOS 5.6.7 Q3 2016

Operational Constraints

  • Requires 256MB free storage space
  • Incompatible with TLS 1.3 cipher suites
  • Discontinued IPv6 transition technology support

Legacy network administrators can access this final stable release through authorized channels at https://www.ioshub.net/fortigate-legacy. For migration assistance to supported platforms, contact our technical preservation team via the portal’s legacy support interface.

Note: Validate firmware integrity using SHA-1 checksum 5c8f7d…f93e42 and review historical security bulletin FG-IR-17-110 before deployment.

​​Technical References​​
: FortiOS 5.6.11 end-of-support notice (2017)
: NP4 hardware acceleration technical specifications
: PCI DSS 3.2 compliance guidelines

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