Ipad and Lutron over VPN

Hello,

Does anybody know about issues to get the Lutron system to work properly over a site to site VPN? Looks like the app is not downloading the XML file

I can get the page displayed however I am not able to complete the download to control the lights system. It just gets a generic error message.

The VPN tunnel works fine, it is built between 2 Cisco ASA devices and I can ping over the tunnel both the Ipad and the Lutron system.

Thanks for any help!!