If you do not use auto-update, you must update the Citrix policy setting or registry values for each Virtual Delivery Agent (VDA) in the site (or the VDA image) after you add, move, or remove Delivery Controllers in the Site. Registry changes can also be updated using Group Policy Object.
Update the FQDN values specified in the Controllers policy setting. This policy setting is located in the Virtual Delivery Agent category.
If you also use ListOfSIDs in your deployment, update the SID values specified in the Controller SIDs policy setting.
Update the ListOfDDCs registry key, which lists the FQDNs of all the Controllers in the Site. (This key is the equivalent of the Active Directory Site OU.) Separate multiple values with spaces. Surround Controller groups with brackets.
If the HKEY_LOCAL_MACHINE\Software\Citrix\VirtualDesktopAgent registry location contains both the ListOfDDCs and FarmGUID keys, ListOfDDCs is used for Controller discovery; FarmGUID is present if a site OU was specified during VDA installation.
Optionally, update the ListOfSIDs registry key: