In a XenApp 6.5 provisioned environment the STA (Secure Ticket Authority) ID is not unique. This is because when a XenApp 6.5 (provisioned) is rebooted the NIC (Network Interface Card) has not completely started and loaded and is not functional when the Citrix services start. Therefor the STA ID is not changed with the MAC Address of the provisioned server (as expected).
Open the Target Device in Read/Write mode and change the startup type to Automatic (Delayed Start) for Citrix XML Service.
You can find the original KB article here.