IP sec tunnel connection from fortiweb

Hi there,

I have fortigate configured as my EDGE device and some ip sec tunnel are created in that fortigate device to access servers behind firewall.

now we have put fortiweb between server and fortigate. everything is working fine but i want to know that how ipsec tunnel created on fortigate can communicate to the server which is back at fortiweb 

need some help please.

Thanks