If your corporate VPN access is via a Fortigate appliance’s proprietary SSL VPN there’s chances you’re using the vendor provided client. Too bad that one doesn’t really plug into modern Linux desktop experience; it’s CLI only and you’re not able to customize the network configuration too much. There’s no source code and thus no way you’ll be able to do anything about it.
With the availability of the new VPN plugin NetworkManager-fortisslvpn we address this. On its backend it uses the free software protocol implementation openfortivpn (thanks to Adrien Vergé) that got some major improvements lately and integrates well with NetworkManager.
Both openfortivpn and the NetworkManager-fortisslvpn plugin will be available in Fedora in next few days; the other distributions will hopefully follow.