FortiOS 5.6.2 Release Notes


This document provides the following information for FortiOS 5.6.2 build 1486:

l Special Notices l Upgrade Information l Product Integration and Support l Resolved Issues l Known Issues l Limitations

For FortiOS documentation, see the Fortinet Document Library.

Supported models

FortiOS 5.6.2 supports the following models.

FortiGate FG-30D, FG-30E, FG-30E_3G4G_INTL, FG-30E_3G4G_NAM, FG-30D-POE, FG50E, FG-51E, FG-52E, FG-60D, FG-60D-POE, FG-60E, FG-61E, FG-70D, FG-70D-

POE, FG-80C, FG-80CM, FG-80D, FG-80E, FG-80E-POE, FG-81E, FG-81E-POE,

FG-90D, FG-90D-POE, FG-92D, FG-94D-POE, FG-98D-POE, FG-100D, FG-100E,

FG-100EF, FG-101E, FG-140D, FG-140D-POE, FG-140E, FG-140E-POE, FG- 200D,

FG-200D-POE, FG-200E, FG-201E, FG-240D, FG-240D-POE, FG-280D-POE,

FG-300D, FG-400D, FG-500D, FG-600C, FG-600D, FG-800C, FG-800D, FG-900D,

FG-1000C, FG-1000D, FG-1200D, FG-1500D, FG-1500DT, FG-2000E, FG-2500E,

FG-3000D, FG-3100D, FG-3200D, FG-3240C, FG-3600C, FG-3700D, FG-3800D, FG-3810D, FG-3815D, FG-5001C, FG-5001D

FortiWiFi FWF-30D, FWF-30E, FWF-30E_3G4G_INTL, FWF-30E_3G4G_NAM, FWF-30D-

POE, FWF-50E, FWF-50E-2R, FWF-51E, FWF-60D, FWF-60D-POE, FWF-60E,

FWF-61E, FWF-80CM, FWF-81CM, FWF-90D, FWF-90D-POE, FWF-92D

FortiGate Rugged FGR-30D, FGR-35D, FGR-60D, FGR-90D
Pay-as-you-go images FOS-VM64, FOS-VM64-KVM
FortiOS Carrier FortiOS Carrier 5.6.2 images are delivered upon request and are not available on the customer support firmware download page.

What’s new in FortiOS 5.6.2                                                                                                                Introduction

What’s new in FortiOS 5.6.2

For a list of new features and enhancements that have been made in FortiOS 5.6.2, see the What’s New for FortiOS 5.6.2 document.

Special Notices

Built-In Certificate

FortiGate and FortiWiFi D-series and above have a built in Fortinet_Factory certificate that uses a 2048-bit certificate with the 14 DH group.

FortiGate and FortiWiFi-92D Hardware Limitation

FortiOS 5.4.0 reported an issue with the FG-92D model in the Special Notices > FG-92D High Availability in Interface Mode section of the release notes. Those issues, which were related to the use of port 1 through 14, include:

  • PPPoE failing, HA failing to form l IPv6 packets being dropped l FortiSwitch devices failing to be discovered
  • Spanning tree loops may result depending on the network topology

FG-92D and FWF-92D do not support STP. These issues have been improved in FortiOS 5.4.1, but with some side effects with the introduction of a new command, which is enabled by default:

config global set hw-switch-ether-filter <enable | disable>

When the command is enabled:

  • ARP (0x0806), IPv4 (0x0800), and VLAN (0x8100) packets are allowed l BPDUs are dropped and therefore no STP loop results l PPPoE packets are dropped l IPv6 packets are dropped l FortiSwitch devices are not discovered l HA may fail to form depending the network topology

When the command is disabled:

  • All packet types are allowed, but depending on the network topology, an STP loop may result

FG-900D and FG-1000D

CAPWAP traffic will not offload if the ingress and egress traffic ports are on different NP6 chips. It will only offload if both ingress and egress ports belong to the same NP6 chip.

FortiClient (Mac OS X) SSL VPN Requirements                                                                                Special Notices

FortiClient (Mac OS X) SSL VPN Requirements

When using SSL VPN on Mac OS X 10.8, you must enable SSLv3 in FortiOS.

FortiGate-VM 5.6 for VMware ESXi

Upon upgrading to FortiOS 5.6.2, FortiGate-VM v5.6 for VMware ESXi (all models) no longer supports the VMXNET2 vNIC driver.

FortiClient Profile Changes

With introduction of the Security Fabric, FortiClient profiles will be updated on FortiGate. FortiClient profiles and FortiGate are now primarily used for Endpoint Compliance, and FortiClient Enterprise Management Server (EMS) is now used for FortiClient deployment and provisioning.

The FortiClient profile on FortiGate is for FortiClient features related to compliance, such as Antivirus, Web

Filter, Vulnerability Scan, and Application Firewall. You may set the Non-Compliance Action setting to Block or Warn. FortiClient users can change their features locally to meet the FortiGate compliance criteria. You can also use FortiClient EMS to centrally provision endpoints. The EMS also includes support for additional features, such as VPN tunnels or other advanced options. For more information, see the FortiOS Handbook – Security Profiles.

Use of dedicated management interfaces (mgmt1 and mgmt2)

For optimum stability, use management ports (mgmt1 and mgmt2) for management traffic only. Do not use management ports for general user traffic.

Upgrade Information

Upgrading to FortiOS 5.6.2

FortiOS version 5.6.2 officially supports upgrading from version 5.4.4, 5.4.5, 5.6.0, and 5.6.1. To upgrade from other versions, see Supported Upgrade Paths.

Before upgrading, ensure that port 4433 is not used for admin-port or adminsport (in config system global), or for SSL VPN (in config vpn ssl settings).

If you are using port 4433, you must change admin-port, admin-sport, or the SSL VPN port to another port number before upgrading.

Security Fabric Upgrade

FortiOS 5.6.2 greatly increases the interoperability between other Fortinet products. This includes:

l FortiAnalyzer 5.6.0 l FortiClient 5.6.0 l FortiClient EMS 1.2.1 l FortiAP 5.4.2 and later l FortiSwitch 3.5.2 and later

Upgrade the firmware of each product in the correct order. This maintains network connectivity without the need to use manual steps.

Before upgrading any product, you must read the FortiOS Security Fabric Upgrade Guide.

FortiClient Profiles

After upgrading from FortiOS 5.4.0 to 5.4.1 and later, your FortiClient profiles will be changed to remove a number of options that are no longer supported. After upgrading, review your FortiClient profiles to make sure they are configured appropriately for your requirements and either modify them if required or create new ones.

The following FortiClient Profile features are no longer supported by FortiOS 5.4.1 and later:

  • Advanced FortiClient profiles (XML configuration)
  • Advanced configuration, such as configuring CA certificates, unregister option, FortiManager updates, dashboard

Banner, client-based logging when on-net, and Single Sign-on Mobility Agent l VPN provisioning l Advanced AntiVirus settings, such as Scheduled Scan, Scan with FortiSandbox, and Excluded Paths FortiGate-VM 5.6 for VMware ESXi   Upgrade Information

  • Client-side web filtering when on-net
  • iOS and Android configuration by using the FortiOS GUI

With FortiOS 5.6.2, endpoints in the Security Fabric require FortiClient 5.6.0. You can use FortiClient 5.4.3 for VPN (IPsec VPN, or SSL VPN) connections to FortiOS 5.6.2, but not for Security Fabric functions.

FortiGate-VM 5.6 for VMware ESXi

Upon upgrading to FortiOS 5.6.2, FortiGate-VM v5.6 for VMware ESXi (all models) no longer supports the VMXNET2 vNIC driver.

Downgrading to previous firmware versions

Downgrading to previous firmware versions results in configuration loss on all models. Only the following settings are retained:

l operation mode l interface IP/management IP l static route table l DNS settings l VDOM parameters/settings l admin user account l session helpers l system access profiles.

If you have long VDOM names, you must shorten the long VDOM names (maximum 11 characters) before downgrading:

  1. Back up your configuration.
  2. In the backup configuration, replace all long VDOM names with its corresponding short VDOM name. For example, replace edit <long_vdom_name>/<short_name> with edit <short_name>/<short_ name>.
  3. Restore the configuration.
  4. Perform the downgrade.

Amazon AWS Enhanced Networking Compatibility Issue

With this new enhancement, there is a compatibility issue with older AWS VM versions. After downgrading a 5.6.2 image to an older version, network connectivity is lost. Since AWS does not provide console access, you cannot recover the downgraded image.

Upgrade Information                                                                                                            FortiGate VM firmware

When downgrading from 5.6.2 to older versions, running the enhanced nic driver is not allowed. The following AWS instances are affected:

  • C3 l C4 l R3 l I2
  • M4 l D2

FortiGate VM firmware

Fortinet provides FortiGate VM firmware images for the following virtual environments:

Citrix XenServer and Open Source XenServer

  • .out: Download the 64-bit firmware image to upgrade your existing FortiGate VM installation.
  • Download the 64-bit package for a new FortiGate VM installation. This package contains the QCOW2 file for Open Source XenServer.
  • Download the 64-bit package for a new FortiGate VM installation. This package contains the Citrix XenServer Virtual Appliance (XVA), Virtual Hard Disk (VHD), and OVF files.

Linux KVM

  • .out: Download the 64-bit firmware image to upgrade your existing FortiGate VM installation.
  • Download the 64-bit package for a new FortiGate VM installation. This package contains QCOW2 that can be used by qemu.

Microsoft Hyper-V

  • .out: Download the 64-bit firmware image to upgrade your existing FortiGate VM installation.
  • Download the 64-bit package for a new FortiGate VM installation. This package contains three folders that can be imported by Hyper-V Manager on Hyper-V 2012. It also contains the file vhd in the Virtual Hard Disks folder that can be manually added to the Hyper-V Manager.

VMware ESX and ESXi

  • .out: Download either the 64-bit firmware image to upgrade your existing FortiGate VM installation.
  • Download either the 64-bit package for a new FortiGate VM installation. This package contains Open Virtualization Format (OVF) files for VMware and two Virtual Machine Disk Format (VMDK) files used by the OVF file during deployment.

Firmware image checksums                                                                                                    Upgrade Information

Firmware image checksums

The MD5 checksums for all Fortinet software and firmware releases are available at the Customer Service & Support portal, After logging in select Download > Firmware Image Checksums, enter the image file name including the extension, and select Get Checksum Code.

Product Integration and Support

FortiOS 5.6.2 support

The following table lists 5.6.2 product integration and support information:

Web Browsers l Microsoft Edge 38 l Microsoft Internet Explorer version 11 l Mozilla Firefox version 54 l Google Chrome version 59 l Apple Safari version 9.1 (For Mac OS X)

Other web browsers may function correctly, but are not supported by Fortinet.

Explicit Web Proxy Browser l Microsoft Edge 40 l Microsoft Internet Explorer version 11 l Mozilla Firefox version 53 l Google Chrome version 58 l Apple Safari version 10 (For Mac OS X)

Other web browsers may function correctly, but are not supported by Fortinet.

FortiManager See important compatibility information in Security Fabric Upgrade on page 9. For the latest information, see FortiManager compatibility with FortiOS in the Fortinet Document Library.

Upgrade FortiManager before upgrading FortiGate.

FortiAnalyzer See important compatibility information in Security Fabric Upgrade on page 9. For the latest information, see FortiAnalyzer compatibility with FortiOS in the Fortinet Document Library.

Upgrade FortiAnalyzer before upgrading FortiGate.

FortiClient Microsoft

Windows and FortiClient

Mac OS X

See important compatibility information in Security Fabric Upgrade on page 9.

l 5.6.0

If FortiClient is being managed by a FortiGate, you must upgrade FortiClient before upgrading FortiGate.

FortiClient iOS l 5.4.3 and later


FortiOS 5.6.2 support

FortiClient Android and FortiClient VPN Android l 5.4.1 and later
FortiAP l 5.4.2 and later l 5.6.0
FortiAP-S l 5.4.3 and later l 5.6.0
FortiSwitch OS

(FortiLink support)

l 3.5.6 and later
FortiController l 5.2.5 and later

Supported models: FCTL-5103B, FCTL-5903C, FCTL-5913C

FortiSandbox l 2.3.3 and later
Fortinet Single Sign-On (FSSO) l  5.0 build 0254 and later (needed for FSSO agent support OU in group filters)

l  Windows Server 2016 Datacenter l Windows Server 2016 Standard l Windows Server 2008 (32-bit and 64-bit) l Windows Server 2008 R2 64-bit l Windows Server 2012 Standard l Windows Server 2012 R2 Standard l Novell eDirectory 8.8

FSSO does not currently support IPv6.

FortiExtender l 3.1.1 and later
AV Engine l 5.247
IPS Engine l 3.426
Virtualization Environments
Citrix l XenServer version 5.6 Service Pack 2 l XenServer version 6.0 and later
Linux KVM l RHEL 7.1/Ubuntu 12.04 and later l CentOS 6.4 (qemu 0.12.1) and later
Microsoft l Hyper-V Server 2008 R2, 2012, and 2012 R2
Open Source l XenServer version 3.4.3 l XenServer version 4.1 and later

Product Integration and Support                                                                                                  Language support

VMware l  ESX versions 4.0 and 4.1

l  ESXi versions 4.0, 4.1, 5.0, 5.1, 5.5, 6.0, and 6.5

VM Series – SR-IOV The following NIC chipset cards are supported:

l Intel 82599 l Intel X540 l Intel X710/XL710

Language support

The following table lists language support information.

Language support

Language GUI
Chinese (Simplified)
Chinese (Traditional)
Portuguese (Brazil)
Spanish (Spain)

SSL VPN support

SSL VPN support

SSL VPN standalone client

The following table lists SSL VPN tunnel client standalone installer for the following operating systems.

Operating system and installers

Operating System Installer
Linux CentOS 6.5 / 7 (32-bit & 64-bit)

Linux Ubuntu 16.04

2333. Download from the Fortinet Developer Network

Other operating systems may function correctly, but are not supported by Fortinet.

SSL VPN web mode

The following table lists the operating systems and web browsers supported by SSL VPN web mode.

Supported operating systems and web browsers

Operating System Web Browser
Microsoft Windows 7 SP1 (32-bit & 64-bit)

Microsoft Windows 8 / 8.1 (32-bit & 64-bit)

Microsoft Internet Explorer version 11

Mozilla Firefox version 54

Google Chrome version 59

Microsoft Windows 10 (64-bit) Microsoft Edge

Microsoft Internet Explorer version 11

Mozilla Firefox version 54

Google Chrome version 59

Linux CentOS 6.5 / 7 (32-bit & 64-bit) Mozilla Firefox version 54

Product Integration and Support                                                                                                  SSL VPN support

Operating System Web Browser
Mac OS 10.11.1 Apple Safari version 9

Mozilla Firefox version 54

Google Chrome version 59

iOS Apple Safari

Mozilla Firefox

Google Chrome

Android Mozilla Firefox

Google Chrome

Product Antivirus Firewall
CA Internet Security Suite Plus Software
AVG Internet Security 2011
F-Secure Internet Security 2011
Kaspersky Internet Security 2011

Other operating systems and web browsers may function correctly, but are not supported by Fortinet.

SSL VPN host compatibility list

The following table lists the antivirus and firewall client software packages that are supported.

Supported Microsoft Windows XP antivirus and firewall software

Product Antivirus Firewall
Symantec Endpoint Protection 11
Kaspersky Antivirus 2009
McAfee Security Center 8.1
Trend Micro Internet Security Pro
F-Secure Internet Security 2009

Supported Microsoft Windows 7 32-bit antivirus and firewall software

SSL VPN support

Product Antivirus Firewall
McAfee Internet Security 2011
Norton 360™ Version 4.0
Norton™ Internet Security 2011
Panda Internet Security 2011
Sophos Security Suite
Trend Micro Titanium Internet Security
ZoneAlarm Security Suite
Symantec Endpoint Protection Small Business Edition 12.0


Resolved Issues

The following issues have been fixed in version 5.6.2. For inquires about a particular bug, please contact CustomerService & Support.


Bug ID Description
442145 httpsd daemon signal 11 crash due to missing default parameter for /endpointcontrol/avatar/download.
442939 Switch-controller Managed FortiSwitch failed to be displayed and triggered Internal Server Error.


Bug ID Description
442808 SSL VPN daemon crash and users disconnected when any one of tunnel users log out.


Known Issues

The following issues have been identified in version 5.6.2. For inquires about a particular bug or to report a bug, please contact CustomerService & Support.

Application Control

Bug ID Description
435951 Traffic keeps going through the DENY NGFW policy configured with URL category.
441996 No UTM AppCtrl log for signature Gmail_Attachment.Download when action is blocked.
Bug ID Description
304199 Using HA with FortiLink can encounter traffic loss during failover.
357360 DHCP snooping may not work on IPv6.
369099 FortiSwitch authorizes successfully, but fails to pass traffic until you reboot FortiSwitch.


Bug ID Description
434959 NGFW policy with App Control policy blocks traffic.

FortiGate 3815D

Bug ID Description
385860 FG-3815D does not support 1GE SFP transceivers.


Bug ID Description
434470 Explicit policy for traffic originating from interface dedicated to FortiLink.
441300 Limited options in FortiLink quarantine stanza to use, giving users no way to trigger the quarantine function.


Known Issues

Bug ID Description
404399 FortiLink goes down when connecting to ForiSwitch 3.4.2 b192.
408082 Operating a dedicated hardware switch into FortiLink changes STP from enable to disable.
415380 DHCP snooping enabled on FortiSwitch VLAN interfaces may prevent clients from obtaining addresses through DHCP.

Workaround: disable switch-controller-dhcp-snooping on FortiLink VLAN interfaces.

445373 For 802.1X, FortiSwitch port disappeared after upgrading FortiGate from 5.6.0 to 5.6.1 with 802.1X enabled without security-group/user-group.


Bug ID Description
366627 FortiView Cloud Application may display the incorrect drill down File and Session list in the Applications View.
368644 Physical Topology: Physical Connection of stacked FortiSwitch may be incorrect.
375172 FortiGate under a FortiSwitch may be shown directly connected to an upstream FortiGate.
402507 In physical/logical topology, threat drill down fails and keeps GUI loading unexpectedly.
408100 Log fields are not aligned with columns after drill down on FortiView and Log details.
441835 Drill down a auth-failed wifi client entry in “Failed Authentication” could not display detail logs when CSF enabled.
442238 FortiView VPN map can’t display Google map (199 dialup VPN tunnel).
442367 In FortiView > Cloud Applications, when the cloud users column is empty, drill down will not load.


Bug ID Description
374247 GUI list may list another VDOM interface when editing a redundant interface.
375036 The Archived Data in the Sniffer Traffic log may not display detailed content and download.
375383 If the policy includes the wan-load-balance interface, the policy list page may receive a javascript error when clicking the search box.


Known Issues

Bug ID Description
398397 Slowness in accessing Policy and Address page in GUI after upgrading from 5.2.2 to 5.4.1.
402775 Add multiple ports and port range support in the explicit FTP/web proxy.
403146 Slow GUI Policy tab with more than 600 policies.
412401 Incorrect throughput reading in GUI-System-HA page.
439185 AV quarantine cannot be viewed and downloaded from detail panel when source is


442231 Link cannot show different colors based on link usage legend in logical topology real time view.
Bug ID Description
412649 In NGFW Policy mode, FGT does not create webfilter logs.
438858 Synchronized log destination with Log View and FortiView display source.
441476 Rolled log file is not uploaded to FTP server by max-log-file-size.


Bug ID Description
439152 FGSP – standalone config sync – synchronizes BGP neighbor.
441078 The time duration of packet-transporting process stops to pre-master node after HA failover takes too long.
441716 Traffic stops when load-balance-all is enabled in active-active HA when npu_vlink is used in the path.
436585 Issues with different hardware generation when operating in a HA cluster.


Bug ID Description
416102 Traffic over IPsec VPN gets dropped after two pings when it is getting offloaded to NPU.

Log & Report

Known Issues


Bug ID Description
442252 WAD stops forwarding traffic on both transparent proxy and explicit web proxy after IPS test over web proxy.

Security Fabric

Bug ID Description
403229 In FortiView display from FortiAnalyzer, the upstream FortiGate cannot drill down to final level for downstream traffic.
409156 In Security Fabric Audit, The unlicensed FDS FortiGate shouldn’t be marked Passed in Firmware & Subscriptions.
411368 In FortiView with FortiAnalyzer, the combined MAC address is displayed in the Device field.
414013 Log Settings shows Internal CLI error when enabling historical FortiView at the same time as disk logging.


Bug ID Description
405239 URL rewritten incorrectly for a specific page in application server.


Bug ID Description
290708 nturbo may not support CAPWAP traffic.
295292 If private-data-encryption is enabled, when restoring config to a FortiGate, the FortiGate may not prompt the user to enter the key.
304199 FortiLink traffic is lost in HA mode.
364280 User cannot use ssh-dss algorithm to login to FortiGate via SSH.
436580 PDQ_ISW_SSE drops at +/-100K CPS on FG-3700D with FOS 5.4 only.
436746 NP6 counter shows packet drops on FG-1500D. Pure firewall policy without UTM.
437801 FG-30E WAN interface MTU override drop packet issue.
438405 HRX/PKTCHK drops over NP6 with 1.5 Gbps.

Known Issues

Bug ID Description
439126 Auto-script using diagnose command fails with Unknown action 0 after rebooting FortiGate.
439553 Virtual wire pair config missing after reboot.
440411 Monitor NP6 IPsec engine status.
440412 SNMP trap for per-CPU usage.
440448 FG-800C will not get IP on the LTE-modem interface using Novatel U620.
441532 Suggest to add SNMP/CLI monitoring capabilities of NP6 session table.



Citrix XenServer limitations

The following limitations apply to Citrix XenServer installations:

  • XenTools installation is not supported.
  • FortiGate-VM can be imported or deployed in only the following three formats:
  • XVA (recommended) l VHD l OVF
  • The XVA format comes pre-configured with default configurations for VM name, virtual CPU, memory, and virtual NIC. Other formats will require manual configuration before the first power on process.

Open Source XenServer limitations

When using Linux Ubuntu version 11.10, XenServer version 4.1.0, and libvir version 0.9.2, importing issues may arise when using the QCOW2 format and existing HDA issues.

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