To setup SSL (SSTP) vpn connection in your iPhone or iPad please follow the next instructions:
1. Install Cisco Anyconnect app from App Store
2. Open Anyconnect app and in Settings section uncheck “Block Untrusted Servers” to allow it.
3. Back to Home, tap Connections -> Add VPN Connection.
4. Enter Description (any name) and Server Address. Tap Save
5. Swipe the AnyConnect VPN switch from OFF to ON and tap Continue
6. Input Username tap Connect, input Password and tap Connect.
7. Wait for the connection.