Nested VPN tunnels
Parallel, independent VPN connections to different sites are not supported; however, FortiClient VPN connection may still be established over existing third-party (for example, AT&T Client) VPN connection (nested tunnels).
Microsoft Windows Server support
For Microsoft Windows Servers, the AV and Vulnerability Scan features for FortiClient are supported.
FortiClient Rebranding Tool not supported
FortiClient (Windows) 6.0.5 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.