Unable to start a Citrix XenApp Passthrough application: Protocol Driver Error

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    A user is unable to start a Citrix XenApp Passthrough application and is presented with the following error from the Citrix Receiver:

    Unable to launch your application. Contact your help desk with the following information: Cannot connect to the Citrix XenApp server. Protocol Driver error



    Due to new functionality of the Citrix Receiver it depends on TCP/IP + HTTP browsing. This has to be configured on the Managed Application.


    Reconfigure the Managed Application to use TCP/IP + HTTP browsing.
    - Open the Managed Application and go to the tab "Publishing"
    - Open The Instant Passthrough settings by clicking on "Settings"
    - Select "Use TCP/IP + HTTP browsing" and provide a name of a Citrix XenApp server and the XML port of this server
    More information how to find the XML port: http://support.citrix.com/article/CTX128115/
    It is also possible to configure this as a default on the Defaults tab in "Setup > Integration > Application Virtualization > Citrix XenApp Publishing" by editing "Settings".