FortiOS 5.6.1 Release Notes


This document provides the following information for FortiOS 5.6.1 build 1484:

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 5.6.1 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 5.6.1 images are delivered upon request and are not available on the customer support firmware download page.

What’s new in FortiOS 5.6.1                                                                                                                Introduction

What’s new in FortiOS 5.6.1

For a list of new features and enhancements that have been made in FortiOS 5.6.1, see the What’s New for FortiOS 5.6.1 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 5.6.1, 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 5.6.1

FortiOS version 5.6.1 officially supports upgrading from version 5.4.4, 5.4.5, and 5.6.0. 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 5.6.1 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 5.6.1, 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 5.6.0, but not for Security Fabric functions.

FortiGate-VM 5.6 for VMware ESXi

Upon upgrading to FortiOS 5.6.1, 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 5.6.1 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 5.6.1 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 5.6.1 support

The following table lists 5.6.1 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 5.6.1 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 5.6.1. For inquires about a particular bug, please contact CustomerService & Support.


Bug ID Description
374969 FortiSandbox FortiView may not correctly parse the FSA v2.21 tracer file (.json).
398332 FortiSandbox results are not showing up in FortiView > FortiSandbox.
408147 Virus detected with correct name but wrong virusid.
411432 scanunitd causes high CPU usage when making configuration changes.


Bug ID Description
402621 Radius Accounting Packet Calling-Station-ID field should return MAC address instead of IP address.
403147 Cannot create guest users with short phone number.
412846 Google Chrome browser display NET::ERR_CERT_COMMON_NAME_INVALID certificate waning on authentication page.
416618 LDAP does not work when number of matching entries is even in user group.
437204 authd sends malformed NTLM TYPE2 to browser and breaks NTLM authentication.
438972 Nested Groups in LDAP authentication does not work when the Domain users in AD is not the Primary Group.


Bug ID Description
367514 Executable files may not be blocked by DLP built-in .exe file-type filter.
416469 DLP quarantined IP when the action is set to block/log-only.
422355 DLP file-type filter cannot detect .mov file during file upload.


Bug ID Description
414243 DNSFilter local FortiGuard SDNS servers failed to respond due to malformed packet.
422407 dnsproxy causes high CPU usage and degradation of DNS traffic.


Bug ID Description
406692 GTP noip-filter blocking IPv6 gtp-u traffic.
412883 Over-subscription of TP2 XAUI when running GTP in LAG with FG3700DX platform.
Bug ID Description
305575 In the Policy List, the NAT column can give more useful information.
416111 FQDN address is unresolved in a VDOM, although the URL is resolved with IP.

FortiGate 92D

Bug ID Description
412432 fgt92d_link running in D state.


Bug ID Description
422750 FortiGate sending corrupted configuration to FortiSwitch.
435219 cu_acd causing memory leak leading to Conserve Mode.
438973 Managed FortiSwitch speed setting not synced in FortiGate HA cluster.


Bug ID Description
378576 The All Sessions > filter application on historical view does not work and suggests adding filter for destination port.
390495 Unable to view web sites in FortiView for 5 minutes, 1 hour, and 24 hours.


Bug ID Description
416678 FG-100E and FG-101E may have firewall lockups in production.
424558 Renaming onetime schedule causes policy activation.
433688 Netflow report for a long, live FTP session is incorrect.
435070 Full Cone NAT not working for WhatsApp video and voice call.
435095 FortiOS ICMP replies or error messages are dropped when asymmetric routing is involved.
435700 RSTP session-helper does not modify the IP in describe payload when the server IP is a VIP.


Bug ID Description
310497 Improve GUI error message when trying to create a VLAN interface and physical interface is not selected.
368069 Cannot select wan-load-balance or members for incoming interface of IPsec tunnel.
373546 Only 50 security logs may be displayed in the Log Details pane when more than 50 are triggered.
373602 Cannot access System > Advanced from the GUI – page keep loading.
374373 Policy View: Filter bar may display the IPv4 policy name for the IPv6 policy.
380943 Webfilter profile, GUI to support search in URL filter table.
388104 Interface list expand column display improperly in VLAN interface in a Zone.
394359 REST API firewall policy lookup does not work properly.
397010 GUI does not display the App-DB and INDUSTRIAL-DB information.
398394 Log viewer, negative filter for severity Information field cannot be done manually.
407938 device-access-list configuration is removed when making a change to the interface in the GUI.
408577 Admin and FortiClient profile cannot be displayed when language is Japanese.
413754 GUI create VDOM link on TP VDOM fails with error.
413891 In Topology > FortiAnalyzer, clicking Configure setting redirects to VDOM security fabric page.
Bug ID Description
413921 In FSSO standard mode, context menu allows you to delete ad-groups polled from CA.
415326 CLI configuration for address object allows IP range, but not in GUI.
418534 IP address, DHCP, allowaccess disappeared when selecting a local-bridge SSID as a member in soft-switch interface.
421263 Multiple wildcard login accounts gives wrong guest account provisioning when Postlogin-banner is enabled.
423410 Zone interface shows as down in the IPv4 Policy page even when its member is up.
434613 GUI cannot select HA monitor interfaces in other VDOMs.
438709 GUI system time is incorrect when setting timezone.
438948 Address object length name is limited in CLI Console tool.
441350 Trying to access the root FortiGate Security Fabric dashboard produces Error 404.


Bug ID Description
392677 The HA widget shows the slave status as Not Synchronized even when the status is synchronized.
404089 Uninterruptible upgrade fails because routes are not yet synced with new master.
414336 Slave cannot sync to master with redundant interface.
416673 The System > HA pane is not in the GUI. HA is supported and can be configured in the CLI.
421639 HA kernel routes are not flushed after failover when cluster has a large number of routes.
423144 Reliable syslog using dedicated HA management interface doesn’t work.
434800 SNMP trap does not reach SNMP server via HA Master when hbdev interface is up.
437390 HA failover triggered before pingserver-failover-threshold is reached.
438374 HA reserved management interface unable to access or ping.


Bug ID Description
412470 When a firewall policy is deleted, traffic is lost.
417411 One-ARM sniffer logs sent/revd shown in reverse direction.
434478 Information incorrect in diag test app ipsmonitor 13.
434592 Ethernet.IP is not recognized in ICS app ctrl signature by sniffer mode.


Bug ID Description
401847 Half of IPsec tunnels traffic lost 26 minutes after powering on a spare FG-1500D.
412863 NP6 drops fragment packet with payload 15319 bytes or higher.
412987 IPsec VPN certificate not validated against PKI user’s CN and Subject.
414899 Apple Cisco IPsec VPN group name (IKE ID) length limit.
415353 Telnet connection timing out with IPsec through MPLS when offloading is enabled.
435124 Cannot establish IPsec phase1 tunnel after upgrading from version 5.4.5 to 5.6.0.

Workaround: After upgrading to 5.6.0, reconfigure all IPsec phase1 psksecret settings.

438648 outbound enable not set on bi-directional IPsec policy.
439923 For FG-60E, 12-character FQDN Peer ID causes communication failure.
440615 When monitor-hold-down-delay is used in IKEv2 then the value of monitorhold-down-delay has no effect and so once the IKE SA for the primary tunnel is established, it immediately takes the secondary down.

Log & Report

Bug ID Description
386668 FortiGate sends FortiAnalyzer different time stamps from its disk log.
391013 Some traffic flow does not show in traffic log.
396319 For the NGFW_vdom, the application UTM log action is always PASS when firewall policy deny the traffic.
409831 Traffic statistic not tally in report.
Bug ID Description
413778 With long VDOM names, no log is displayed when only one field subtype forward is added to traffic log filter.
417128 Syslog message are missed in FortiGate.


Bug ID Description
414496 URL getting Blocked -IPS SensorTriggered.
415627 After upgrading to 5.6, certificate inspection causes certificate warning.
418193 Some HTTPS sites show Secure Connection Failed (static URL filter only flow-based webfilter, certificate inspection).
424362 Multiple crashes of WAD process.
437990 MiTM Proxy mode HTTPS Interception Weakens TLS Security.


Bug ID Description
397087 VRIP cannot be reached on FG-51E when it is acting as VRRP master.
412336 Specific static route on vwl member interface should not be controlled by vwl status.
415366 WAN LLB with IP pools configured for two ISP connections.
424381 TCP sessions are stuck or time out randomly.
434026 SD-WAN health check does not remove route.

Security Fabric

Bug ID Description
385341 If there are multiple FortiAPs managed, GUI cannot display managed FortiAPs in FortiView > Physical Topology page.
403085 The session tab cannot be displayed on historical page when you drill down.
406561 Matching username is not highlighted in tooltip after topology search.
Bug ID Description
408495 An improper warning message may appear in the FortiAnalyzer log when changing the root FortiGate to a downstream FortiGate.
411479 The icon used to signify the source of logs when the time range is set to now is incorrect.
411645 Drilling down from a root FortiGate to a downstream FortiGate causes an error.
412104 The drill down for an aggregated device is not displayed as an individual device.
412249 Threats of a downstream FortiGate cannot be displayed on the root FortiGate.
412930 The Security Audit Event is not hidden on Security Fabric child nodes.
413189 The bubble chart with FortiAnalyzer view may not be drawn correctly.
413492 Security Fabric topology change can cause high CPU usage by miglogd on Security Fabric root.
413742 In Security Fabric topology, the red circle to indicate the root node of the Security Fabric should not be displayed on each child FortiGate.
413912 In Security Fabric topology, the upstream FortiGate can still be displayed when Security Fabric is disabled on a downstream FortiGate.
414147 In Security Fabric topology, the topology cannot be updated after changing the upstream port on a child FortiGate.
414301 Security Fabric topology is not displayed due to js error Cannot read property ‘VDOM’ of undefined.


Bug ID Description
378207 authd process causes high CPU usage when only RSSO logging is configured.


Bug ID Description
398277 Application scanunit crashes with signal 6 received.
408971 Management Traffic is sent out via wrong interface in Virtual WAN Link.
410420 Spam emails are exempted if they are sent in one session.
Bug ID Description
416790 (no.x pattern matched) is not logged when bwl matches envelop MAIL FROM.
424443 Client behind FG-60E cannot get bounced mail when sending a spam mail to Hotmail /Outlook.


Bug ID Description
304528 SSL VPN Web Mode PKI user might immediately log back in even after logging out.
380974 Possible root cause of SSL VPN fail with error:0B080074: ..X509_check_ private_key:key values mismatch/ApacheSSLSetCertStuff.
396788 SSL VPN GUI is unable to keep SSO password information for user bookmark.
399784 URL modified incorrectly in a dropdown list in application server.
406028 Citrix with Xenapp 7.x not working via SSL VPN web portal.
408624 SSL VPN certificate UPN+LDAP authentication works only on first policy.
412850 SSL VPN portal redirect fails with a Javascript error.
413758 Auto-generated SSL interface do not associate with SSLVPN_TUNNEL_ADDR1 for a long name VDOM.
414074 Application with Jira 7.2 and higher does not display properly in SSL VPN web mode.
415543 Request ability to exclude certain services from being created via personal bookmark.
415746 SSO on SSL VPN HTTP bookmark uses OTP instead of password in Auth HTTP header field when user authenticates via TFA.
423415 Incorrectly resolved membership for group members using SSL VPN.
424561 SSL VPN web mode has trouble loading certain page in HTTP/HTTPS bookmark.
433779 RDP bookmark doesn’t work after upgrading to 5.6.
438004 A bookmark having access link to a web page does not work via SSL VPN web mode.


Bug ID Description
383126 FG-50E/FG-51E TP mode – STP BPDU forwarding destined to 01:80:c2:00:00:00 stops after warm/cold reboot.
396781 Interface policy cannot block traffic encapsulated in PPPoE.
403572 Fragmentation not working on VLAN with mtu-override on NP6.
410463 SNMP is not responding when queried on a loopback IP address with an asymmetric SNMP packet path.
412184 If you use port 4433 for the admin-port, admin-sport, you cannot access GUI anymore.
412244 Fortitoken Mobile push won’t work when VDOM is enabled.
413885 long-vdom-name of global setting is disabled after exe factoryrest2.


The diagnose hardware test system cpu, diagnose hardware test cpu model, and diagnose hardware test bios fail to produce a correct hardware report.

Affected models: FortiGate / FortiWiFi 30E, 50E, 51E, 52E, 60E, 61E, 80E, 81E, 100E, 100EF, 101E, and 140E series.

414242 Offload not supported on 200E aggregate interfaces.
414482 The pre-allocated size for interface cache and policy cache is not big enough.
415555 IPv6 ipv6-neighbor-cache configuration is lost after a reboot or flush command.
416950 NP6 stops process traffic through IPsec tunnel.
417644 When remote wildcard admin with Radius accprofile-override is enabled (super admin), restoring config fails on slave.
420150 NTPv3 with authentication enabled fails with error receive: authentication failed.
421813 With VDOM enabled, after restoring a VDOM, the members of a zone are removed.
422414 FG-90D + FG-100D modem port not responding.
422755 FG-60D removes session unexpectedly – memory_tension_drop increase even though memory usage is very low.
423039 After the upgrade from 5.4.4 to 5.6.0, FortiGate cannot receive public IP with Netgear Aircard 341U.
Bug ID Description
423375 Some configurations are missing in the output of show full-configuration.
424213 Cluster virtual MAC address is changed to physical port MAC address when ports are assigned on MGMT-VDOM.
434480 Admin user session does not time out.
434823 Firewall system halted when the sniffer is enabled in console.
436211 Kernel conserve mode due to memory leak.
436437 FortiGate cannot apply the FortiClient renew license from FortiGuard server.
437599 ICMP unreachable packet is blocked by transparent FortiGate.
438197 PPPoE connection is disrupted by HA failover/failback.
438944 BPDU frames are not changed in TP mode when one arm is connected to multiple VLANs.
439897 Virtual wire pair on asymmetric environment issue.
440041 DHCPv6 seems to fail when ip6-mode is DHCP – failed to assign link-local address.
Bug ID Description
414402 vmtoolsd continuously crashes.


Bug ID Description
378085 User authentication timeout max setting change.
410901 PKI peer CA search stops on first match based on CA subject name.
412487 RSSO Endpoint Storage limits the number of characters to 48.
421456 FortiGate cannot authenticate with Cisco ISE Radius and token.
434849 Guest UserEmail Template cut off when emailed to the recipient.
439760 User name is not visible in logs and on blocking page when using explicit proxy and Kerberos authentication.


Bug ID Description
414811 Restore NIC offload capabilities on FortiGate KVM VM.
416783 FortiGate Image for ESXi loses interface information when reboot-upon-configrestore is disabled and a config is restored.
438174 Fortinet VM Product range device detection improved.


Bug ID Description
423437 SIP ALG does not translate all MSRP SEND messages if more than one SEND message is contained within a single packet.


Bug ID Description
398405 WAD crashes without backtrace – WAF HTTP header matching problem.
406292 After update to 5.4.3 (B1111), WAD sometimes crashes.
415385 Explicit FTP proxy issue on zero file size transfers.
417491 WAD crashes when handling FTP over HTTP traffic.
421092 WAD consuming memory when explicit webproxy is used.
423077 WAD crashed after upgrading from 5.2.10 to 5.4.4 GA release.
423128 Unable to access when deep inspection is enabled on explicitproxy policy.
424208 Expired certificates with valid issuers are treated as untrusted.
438759 TeamViewer not blocked with explicit proxy application control with SSL “deep inspection”.


Bug ID Description
396580 Memory leak and crash reported for hostapd.
409110 Web page override login page loads slowly.
413214 Remote APs traffic not working.
Bug ID Description
413693 WPA_Entreprise with Radius Auth mode fails with VDOM that has a long VDOM name.
417001 Explicit HTTP proxy drops HTTPS connections on WiFi rating failures.
420967 Proxy AV + Proxy WF + SSL Certificate Inspection (Inspect All Ports) results in HTTPS traffic bypassing WiFi.
423020 Regex value changes in the URL filter.
436354 Replace Message Group Web FilterBlock Override page not working.
438003 Part of APs failed to be managed by FortiGate because cw_acd crashed in CMCC portal authentication.

Common Vulnerabilities and Exposures

FortiOS5.6.1 is no longer vulnerable to the following issues and CVE references. For more information, see

Bug ID Description
409913 l 2017-3130
414418 l 2017-3131 l 2017-3132 l 2017-3133
416322 l 2017-2636
416914 l 2016-10229
421539 l 2009-3555
422133 l 2009-3555
438599 FortiOS: SHA1-intermediate is not transfer to browser after proxy DPI.
440744 FortiOS: Reflected XSS in Web Proxy Disclaimer Response web page due proxy URL has not been sanitized.


Known Issues

The following issues have been identified in version 5.6.1. 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
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.


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
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.


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 SnifferTraffic 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.
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.

Known Issues

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


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

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.


Known 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.
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.

Known Issues

Bug ID Description
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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