I want to configure a VPN connection, so choose VPN Connections->Configure VPN..., and I get to the Network Connections dialog. But the Add button is disabled. How do I enable it?

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This sounds like your issue. I found it in this articled titled: Gnome Network Manager VPN Tab Disabled ( Greyed out ).

                   ss #1

excerpt from the article

The Add tab is greyed out when required plugins are not installed for Gnome NetworkManager. The following plugins should be installed under Debian / Ubuntu Linux:

  1. network-manager-openvpn and network-manager-openvpn-gnome - network management framework OpenVPN plugin GNOME GUI
  2. network-manager-pptp and network-manager-pptp-gnome - network management framework PPTP plugin GNOME GUI
  3. network-manager-strongswan - network management framework strongSwan ipsec vpn plugin
  4. network-manager-vpnc and network-manager-vpnc-gnome - network management framework (VPNC plugin GNOME GUI)

To install all of the above plugins use the apt-get command as follows:

  $ sudo apt-get install network-manager-openvpn network-manager-pptp \
        network-manager-pptp-gnome network-manager-vpnc

The following plugins should be installed under RHEL / Fedora / CentOS / Scientific Linux / Red Hat Enterprise Linux desktop systems:

  1. NetworkManager-openvpn : NetworkManager VPN plugin for OpenVPN
  2. NetworkManager-pptp : NetworkManager VPN plugin for pptp
  3. NetworkManager-vpnc : NetworkManager VPN plugin for vpnc

To install all of the above plugins use the yum command as follows:

  $ sudo yum install NetworkManager-vpnc NetworkManager-pptp \

Now, you can add vpn connection to your system using NetworkManager itself. You may need to restart the NetworkManager as follows:

  $ sudo NetworkManager restart

                   ss #2


You have to install the network manager:

sudo aptitude install network-manager-vpnc

As well as the gnome client:

sudo aptitude install network-manager-vpnc-gnome

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