vDisk shows unconnected (RED X in status tray) when attempting to create a 6.x image.
Microsoft Network Monitor 3 Driver interferes with the Provisioning Services Target Device software while loading.
Changing the load order of the Microsoft Network Monitor driver through the OS registry resolves this issue.
Caution! This procedure requires you to edit the registry. Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Citrix cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use the Registry Editor at your own risk. Back up the registry before you edit it
To resolve this issue, change the Start key from “1” to “0”:
Here’s the original article.