Lately, I have been coming across many customers that are not leveraging the full potential of Citrix provisioning services simply because they are not configuring the product the right way. Basically, they are using it with all the defaults configured during installation.
One of those defaults, if not modified, will limit Citrix Provisioning Services to support only 160 devices. These devices can range from physical or virtual, but if you are planning on using the product for VDI, for instance, and you will be supporting more than 160 devices, I suggest you keep reading.
During the initial configuration of provisioning services, you are prompted to configure the number of UDP ports that you want to make available for use by target devices. If left unchanged, the default is 20 ports. These are ports on the PVS server for which devices can connect to and stream virtual disks.
Also by default, the advanced settings configure the server for 8 threads per UDP port.
To learn more and to read the entire article at its source, please refer to the following page, How To Configure Citrix Provisioning Services To Target More Devices- Virtualization Review Blogs