I'm the L2TP VPN Server user. After I updated my phone to Android 4.0.4. The L2TP VPN was out of work. I found the racoon module has some trouble. So I built up a new one base on Android Source Code. We can replace this module to /system/bin, and set permission -rwx-r-x-r-x like this picture. Reboot your phone and enjoy it.
Download From My Server: Download
Download From Dropbox: Download