View current VPN sessions on an ASA via CLI
To view current sessions
sh vpn-sessiondb remote (IPSec Remote VPN Clients)
sh vpn-sessiondb l2l (L2L Tunnels)
sh vpn-sessiondb svc (SSL VPN / Anyconnect Clients)
sh vpn-sessiondb webvpn (Clientless sessions)
sh ssh sessions (show users connected to ASA via SSH)
To terminate a session
vpn-sessiondb logoff name username (where username is the name of the user you want to log off)