Accessing Virtual Domains Locally

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I have recently bought a Cisco SA540 which apparently has a major bug and I cannot view my websites using my domain locally. I can only access ISPconfigs main control panel but since the same ip applies to all the domains I can't reach other websites.

What do I need to do in order to access the websites of my ISPconfig 3 webserver using the servers DMZ ip?

Example: Instead of mydomain.com to type the IP address of the server 172.16.1.100/theWebsiteIwantToAccess so I can view them in my browser.

Is this possible?