Are you deploying this as an or as an IT administrator via EMS?
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During or immediately after installation, macOS will block certain core components of FortiClient. You must unblock them for the VPN or antivirus modules to work.
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Look for a message stating: "System software from developer 'Fortinet' was blocked from loading."
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FortiClient 6.4.3 is a version of Fortinet's endpoint protection client for macOS devices. It integrates several security technologies, most notably an SSL VPN client for secure remote access to a corporate network. It also provides features like an endpoint firewall, web filtering, and antivirus/malware protection, which can be managed either as a standalone application or centrally via Fortinet's FortiClient EMS (Endpoint Management Server). forticlient 6.4 3 download macos
Disclaimer: As of 2026, Fortinet primarily supports newer versions (7.x and above). Using older versions like 6.4.3 should be done with awareness of reduced support for the latest macOS security updates. FortiClient (macOS) Release Notes - AWS
: On your FortiGate (admin access), force SSL VPN to support TLS 1.2. Or use IPsec instead.
Always download security software from verified sources to protect your system from malware. Method 1: The Fortinet Support Portal Are you deploying this as an or as
: Supports both SSL VPN and IPsec VPN tunnels with full encryption.
If you have an older version of FortiClient installed, you must completely uninstall it before installing 6.4.3. Use the FortiClient Uninstaller included in the DMG file, or drag the app to the Trash and restart your Mac before trying again.
Select Prompt on login or Save login depending on security protocols. Click Save . Troubleshooting Common Issues VPN Disconnects at 40% or 98% : Look for a message stating: "System software