一、安装openconnect

openconnect是Cisco的AnyConnectSSL VPN的Linux客户端。而NetworkManager-openconnect则是把openconnect的命令行工具，集成到了NetworkManager的图形界面上，它的使用与Window差不多。

$ sudo yum install openconnect   (在Fedora上，会顺带安装：vpnc-script.noarch，这个包会被openconnect用到)

$ sudo yum install NetworkManager-openconnect

二、在命令行下使用openconnect

$ sudo openconnect --script /etc/vpnc/vpnc-script https://your-vpn-server.com

Attempting to connect to 121.0.29.22:443
SSL negotiation with vpn.taobao.org
Server certificate verify failed: signer not found
Certificate from VPN server "your-vpn-server.com" failed verification.
Reason: signer not found
Enter 'yes' to accept, 'no' to abort; anything else to view: yes
Connected to HTTPS on your-vpn-server.com
GET https://your-vpn-server.com/
Got HTTP response: HTTP/1.0 302 Object Moved
SSL negotiation with your-vpn-server.com
Server certificate verify failed: signer not found
Connected to HTTPS on your-vpn-server.com
GET https://your-vpn-server.com/+webvpn+/index.html
Please enter your username and password.
Username: your-name
PASSCODE: ********
POST https://your-vpn-server.com/+webvpn+/index.html
Got CONNECT response: HTTP/1.1 200 OK
CSTP connected. DPD 30, Keepalive 20
Connected tun0 as 10.1.25.155, using SSL

三、在NetworkManager上使用openconnect

第一步：创建新的VPN，选择VPN类型为：

第二步：填写VPN服务器，并点Save：

第三步：选择VPN，输入用户名、密码。