I have a machine catalog of 10 Windows 7 VMs. When I start the VM I can ping the DDC and vise versa. The machines show up as "Registered" in Citrix Studio.
When I login to Receiver it automatically tries to start the virtual desktop. The virtual desktop starts, I get the login notification screen where you have to press "OK" to accept the Acceptable Use Policy and then it says "Welcome..." with the spinning cirlce. It spins here for a while then the Receiver client with the virtual desktop closes and goes back to the home screen. Here, the virtual desktop icon is listed with a green dot, meaning the virtual desktop is running. However, in XenServer, I can see the VM shutting down.
There are no entries in the Event Logs on the DDC or on the VDA client. I've confirmed with XDping and manual reg entries that the VDA client is able to resolve the name/IP of the DDC. It's also registering successfully as evidence by the status indicated on the DDC in Citrix Studio under "Search".
Briefly, right as the Receiver connection closes the virtual desktop, I can see that my username is logged in on the DDC.