When you create layers in a XenServer environment, you need a Connector Configuration to define the hypervisor location from which you:
Citrix recommends that you use the hypervisor where you install the App Layering appliance. If you create layers on a hypervisor other than the installed appliance, you can use a network file share instead of a XenServer Connector Configuration. You can manually copy the file from your hypervisor to the file share after you install the software for the layer.
For details, about configuring a Conector, see XenServer Connector Configuration
For details about using a network file share instead of a Connector Configuration, see Network file share on the appliance