Ambari webpage is not accessible on Azure

Hi,
have checked out a Hadoop distribution by Horton Works from Azure portal in evaluation mode. Azure created a cluster with 5 VMs (2 masters and 3 workers). On the first master VM, I see that one of the TCP endpoints is listed as Ambari Server 8443. I wanted to quickly manage the hadoop cluster using the ambari webpage to see which services are running and which are stopped, and so tried going to this URL in my browser http://104.210.41.102:8443 but I got a blank page. This is the virtual IP address of the master VM. Next I tried with the DNS name http://blah-master-01.cloudapp.net:8443, and still no luck!
What am I missing?