Nested VPN tunnels
FortiClient (Windows) does not support parallel, independent VPN connections to different sites. However, you may still establish FortiClient VPN connection over existing third-party (for example, AT&T Client) VPN connection (nested tunnels).
Microsoft Windows Server support
FortiClient (Windows) supports the AV and Vulnerability Scan features for Microsoft Servers.
FortiClient Rebranding Tool not supported
FortiClient (Windows) 6.0.9 does not support the FortiClient Rebranding Tool.
HP Velocity and Application Firewall
When using an HP computer, a conflict between the HP Velocity application and FortiClient Application Firewall can cause a blue screen of death or network issues. If not using HP Velocity, consider uninstalling it.