XenDesktop 5 Virtual Machines do not successfully register with the Desktop Delivery Controller (DDC).

Background

Using Nslookup with the Fully Qualified Domain Name (FQDN) and IP address to the Virtual Desktop Agent and Desktop Delivery Controller, returns correctly. The firewall or anti-virus software is not causing the issue.
Virtual Desktop Agent is installed with domain administrator account and correct FQDN of Desktop Delivery Controller is entered in Virtual Desktop Agent configuration. Desktops do not register. Pinging the hostname of Desktop Delivery Controller returns an IPv6 address even though IPv6 is disabled on the Network Interface Card (NIC). Disabling IPv6 on the NIC, and pinging the hostname returns an IPv6 loopback address of:1.

Problem Cause

The introduction of XenDesktop 5 supports installations on Microsoft Windows 2008 Server and the wider implementation of Microsoft Windows 7 desktops. These operating systems have IPv6 enabled in the NIC properties by default.