The VPN establishes an encrypted tunnel to provide secure access to company resources through TCP on port 443. Creating a site-to-site SSL VPN. We want to establish secure, site-to-site VPN tunnels using an SSL connection. This VPN allows a branch office to connect to the head office.
Clientless Access - Sophos Configure: VPN: Clientless Access Clientless Access Using clientless access, you can allow users to access services and areas on your network such as remote desktops and file shares using only a browser, and without the need for additional plug-ins. Clientless access … MicroNugget: What is Clientless SSL VPN Plugins on the ASA Oct 17, 2012
Unfortunately Clientless VPN is not supported on any version of FTD, not even on the latest version 6.5. This feature is not expected in the upcoming FTD 6.6 either. If you speak to your Cisco partner they might be able to give you further roadmap details.
MicroNugget: What is Clientless SSL VPN Plugins on the ASA
GlobalProtect Clientless VPN Users have the advantage of secure access from SSL-enabled web browsers without installing the GlobalProtect software. This is useful when you need to enable partner or contractor access to applications, and safely enable unmanaged assets, including personal endpoints.
WebVPN (or often called SSL VPN) (or sometimes called clientless VPN) is used when someone needs to access a web based application that is on the private network. A web browser is used for all the encryption and authentication. Remote Access Using Clientless VPN