I was interested in SSL VPN because I thought that I could have the same functionality I have when connecting via Cisco VPN 3000 concentrator (IPSec with AH and ESP enabled), but without the hassle to deploy and maintain client VPN's for thousands of users.
However, to my disappointment, based on the information below from www.cisco.com (and I believe that it is the case from other vendors, right?) SSL VPN offers limited functionality if deployed clientless. Why is like that?
Imagine I have a VPN (IPSec) solution functional today. If I deploy SSL VPN (clientless) what lack in functionality should I experience? Why a VPN client is required if SSL VPN can successfully establish the tunnel? I don't get it.
"...SSL VPNs provide two different types of access: clientless access and full network access. Clientless access requires no specialized VPN software on the user desktop; all VPN traffic is transmitted and delivered through a standard Web browser. Because all applications and network resources are accessed through a browser, only Web-enabled and some client-server applications-such as intranets, applications with Web interfaces, e-mail, calendaring, and file servers-can be accessed using a clientless connection. This limited access is suitable for partners or contractors that should be provided access to a limited set of resources on the network. And because no special-purpose VPN software has to be delivered to the user desktop, provisioning and support concerns are minimized."