Comment 102 for bug 93413

a more logical aproach:

mv /usr/sbin/vpnc /usr/sbin/vpnc2
vi /usr/sbin/vpnc #new file with content:

#!/bin/bash
export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
cat | /usr/sbin/vpnc2 --non-inter --no-detach --dpd-idle 0 -

chmod +x /usr/sbin/vpnc