Looking for someone out there that has set up the L2TP server on a SonicWall!

I've enabled the L2TP server on my SonicWall firewall. I can establish a VPN connection over 3G and browse to shares on a physical Windows Server 2008 using a file browser application for iPad. I cannot connect to shares on any of 4 virtualized Windows 2008 servers using the same VPN connection and App.

I am able to connect to all shares while connected to the Wifi network that is an extension of the server network where the shares are located.

Please advise.