If you are trying to connect using the Cisco AnyConnect GUI client, and you are encountering an error message that appears immediately after clicking "Connect", you can get more information by exiting the app, and initiating it from the terminal.
/opt/cisco/anyconnect/bin$ ./vpnui
You may then recreate the error within the GUI, and get more diagnostic information from the terminal window.
/opt/cisco/anyconnect/bin/acwebhelper: error while loading shared libraries: