ISA550 and ISA550W support 25 SSL VPN users. ISA570 and ISA570W support 50 SSL VPN users. To configure the users and user groups for SSL VPN access, go to the Users > Users and Groups page.
You can assign all SSL VPN users to one user group. However, if you have multiple SSL VPN group policies, you can create multiple user groups and specify different SSL VPN group policies for them. Specifying a SSL VPN group policy for a user group can enable the SSL VPN service for all members of the user group. For complete details, see Configuring Users and User Groups, page 321.
According to the user authentication settings specified on the security appliance, the SSL VPN users can be authenticated by the local database or external AAA server (such as Active Directory, LDAP, or RADIUS). For information on configuring the user authentication settings, see Configuring User Authentication Settings, page 325.