vpnc configuration

edit /etc/vpnc/default.conf

#IPSec gateway my.vpn.gateway
#IPSec ID my.ipsec.id
#IPSec secret mysecret
# your username goes here:
#Xauth username


IPSec gateway my-gateaway.com
IPSec ID my-ipsec-id
IPSec obfuscated secret 2DE878F2B77008ACB5368DFD3A3BEA3724DDA4
Xauth username my-username
Xauth password my-password

If you dont include Xauth password, vpnc will promt.