PVS server fail to boot with error “Login request timed out”

High percentage of PVS provisioned desktop servers fail to boot. This is the sequence of the events: 1. The servers boot with an ISO. 2. The tsbbdm.bin is downloaded from the 1st PVS on the site. 3. The streaming process fails. 4. Error pops up :“Login request timed out”. Rebooting the PVS server...