A Virtual Delivery Agent (VDA) is installed on each physical or virtual machine in your site that you want to make available to users. It enables the machine to register with the Citrix Cloud Connector, which in turn allows the machine and the resources it is hosting to be made available to users. VDAs establish and manage the connection between the machine and the user device, verify that a Citrix license is available for the user or session, and apply the policies that have been configured for the session. The VDA communicates session information to the Connector through the broker agent in the VDA.
XenApp and XenDesktop include VDAs for Windows server and desktop operating systems. VDAs for Windows server operating systems allow multiple users to connect to the server at one time. VDAs for Windows desktops allow only one user to connect to the desktop at a time. Some cloud providers limit the use of Windows desktop operating systems. For VDI deployments, see Server VDI.
Citrix recommends installing the latest version of the VDA. The minimum requirement for the XenApp and XenDesktop Service is version 7.0. Versions earlier than 7.6 might encounter registration issues. For more information, see the Upgrade article.
For general and preparatory information about installing a VDA, see VDA installation guidance.
For instructions on using scripts to install a VDA, see the Install VDAs using scripts article.
The XenApp and XenDesktop Service download page provides access to several downloads, including the VDA standalone installer.
Citrix account credentials are not required to access the VDA download page from within the XenApp and XenDesktop Service; however, credentials are required if you want to download other Citrix software that is restricted to customers. You must either have elevated administrative privileges before starting the installation or use Run as administrator. Disable User Account Control (UAC).
- From the Downloads page, click Download VDA.
- Select the version you want to install (Server OS or Workstation OS) and click Download File.
- Right-click the package and select Run as administrator.
- Follow the wizard. An automatic restart is enabled by default when the installation completes; the restart is required before the VDA can be used with the XenApp and XenDesktop Service.
See What to specify when installing a VDA for details about each page in the wizard. THe following items are unique to the XenApp and XenDesktop Service environment:
Note: On the Delivery Controller page, choose the Do it manually option, and then specify the FQDNs of the Citrix Cloud Connectors in your resource location. Citrix recommends specifying multiple Connectors for high availability. The installer attempts to connect to the specified addresses and indicates the test result.