- Upgrade a XenApp 6.5 worker to a new VDA
After you migrate a XenApp 6.5 farm, you can use your XenApp 6.5 servers that were configured in session-host only mode (also called session-only or worker servers) by removing earlier software and then installing a new VDA for Server OS.
NOTE: Although you can upgrade a XenApp 6.5 worker server, installing the current VDA software on a clean machine provides better security.
To upgrade a XenApp 6.5 worker to a new VDA:
After you install the new VDA, from Studio in the new XenApp Site, create machine catalogs (or edit existing catalogs) for the upgraded workers
Symptoms: Removal of the XenApp 6.5 software fails. The uninstall log contains the message: "Error 25703. An error occurred while plugging XML into Internet Information Server. Setup cannot copy files to your IIS Scripts directory. Please make sure that your IIS installation is correct."
Cause: The issue occurs on systems where (1) during the initial XenApp 6.5 installation, you indicated that the Citrix XML Service (CtxHttp.exe) should not share a port with IIS, and (2) .NET Framework 3.5.1 is installed.