Install Openconnect

Network Manager needs the Openconnect plugin first.

Ubuntu/Debian

sudo apt-get install network-manager-openconnect network-manager-openconnect-gnome

RHEL/Fedora

sudo yum install NetworkManager-openconnect

Configure

In Network Manager, go to

VPN Connections > Configure VPN > Add

Then choose

Cisco Anyconnect Compatible VPN

Enter the following settings:

Click save, and then activate the VPN in Network Manager.

VPN Connections > [your vpn]

You will be prompted for a username and password on connecting.