(SSL VPN is a feature of Fortinet's FortiGate firewalls, which run the proprietary FortiOS Linux-based operating system. Most other Fortinet devices have no VPN capability – the only exception is/was FortiProxy, Fortinet's secure web proxying solution. Older versions of FortiProxy – 7.2.x and earlier – do support SSL VPN in certain configurations, but the functionality has been removed as of version 7.4.4.)