 Hello,  In the control panel of the SSL Gateway server. You'll have the Secure-IT control panel.  Open that and you can set up the Web Proxy  Set the Web Proxy so the destination address is the address for your actual webserver.  Your Users will type the External FQDN of the SSL Gateway, this will then forward the request through to the Web Server on the internal network (Assuming you have access from the DMZ to the internal webserver on port80)  You'll also want to set up an RDP Proxy at the same time.  With these configured, you only need 443 open to the SSL Gateway and then port 80 open from the SSL Gateway to the Web Server and 3389 open from the SSL Gateway to the actual Terminal Servers/VDI.  Thanks, Andrew 
Forgive this basic question...  I have a SSL Gateway in our DMZ with public IP and an SSL cert.  I have the Web Access server inside our network with a private address.  We have users that will access this from the inside network so we wanted all that traffic to stay inside the firewall and only want external users going through the firewall.  Access inside seems to be working fine.    So here is my basic question.  From the outside, what is the URL that they should be using?  It sounds like they should be using the FQDN for the SSL Gateway but there is no web site on there so where does the page get published? Or is this architected wrong?
External access for Web Access through SSL Gateway