Cisco VPN via vpnc - config issues

[Kevin Kempter]

Hi all ;

I've installed vpnc on Fedora 10

I have a cisco connection on a mac that works fine.

I've tried to re-create in a vpnc config file like this (I replaced the values 
for security):

IPSec gateway 1.2.3.4
IPSec ID custname
IKE Authmode psk
IPSec secret psk_secret
# your username goes here:
Xauth username assigned_username

I always get this response:
Enter password for assigned_username@1.2.3.4:
vpnc: no response from target

Can anyone help me debug this ?

Thanks in advance