NetworkManager-vpnc snapshot svn2914 never manages to make a vpn connection.
I've confirmed that it works if you run vpnc directly.

/var/log/messages has the following to say:
Oct  8 15:51:36 albook NetworkManager: <info>  VPN service
'org.freedesktop.NetworkManager.vpnc' exec scheduled...
Oct  8 15:51:36 albook NetworkManager: <info>  VPN service
'org.freedesktop.NetworkManager.vpnc' executed
(org.freedesktop.NetworkManager.vpnc), PID 2768
Oct  8 15:51:36 albook kernel: tun: Universal TUN/TAP device driver, 1.6
Oct  8 15:51:36 albook kernel: tun: (C) 1999-2004 Max Krasnyansky
<maxk>
Oct  8 15:51:36 albook NetworkManager: <info>  VPN service
'org.freedesktop.NetworkManager.vpnc' just appeared, activating connections
Oct  8 15:51:36 albook NetworkManager: <info>  VPN service
'org.freedesktop.NetworkManager.vpnc' just appeared, activating connections
Oct  8 15:51:36 albook NetworkManager: nm_vpn_connection_activate: assertion
`nm_vpn_connection_get_state (connection) == NM_VPN_CONNECTION_STATE_PREPARE' failed

After a minute or so, this times out and I get the prompt window for the vpn
info. I fill that in and nothing happens. Here's the relevant log info:

Oct  8 15:52:32 albook NetworkManager: <info>  VPN connection 'RDU' (Connect)
reply received.
Oct  8 15:52:32 albook NetworkManager: <WARN>  connection_state_changed(): Could
not process the request because no VPN connection was active.

Further attempts to bring up the VPN fail immediately with the above two log
messages.