Product Documentation

Known issues

The XenApp and XenDesktop 7.18 release contains the following issues. (Components and features that are documented separately have their own known issues articles.)

This warning applies to any workaround that suggests changing a registry entry:


Editing the registry incorrectly can cause serious problems that might require you to reinstall your operating system. Citrix cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. Be sure to back up the registry before you edit it.


  • Due to the way that Microsoft App-V behaves, when you publish multiple sequenced versions of the same app using the single admin or the dual admin management method, only one version of the app is able to launch at a time per user on the VDA. Whichever version a user launches first, determines the version which runs subsequently for them. The same behavior occurs even when Citrix components are not involved and the user starts the sequenced apps from desktop shortcuts which point to different paths. To date we (Citrix) have seen this occur for different versions of Mozilla Firefox and Google Chrome browsers. [APPV-60]

Install and upgrade

  • XenApp and XenDesktop Site upgrade to version 7.18 fails if the Monitor database is on SQL Server 2008 R2. To circumvent this issue, choose one of the following options:

    • Upgrade your SQL server to version 2012 or later, and then upgrade the XenApp and XenDesktop Site.
    • Use the patched MSI to install or upgrade the XenApp and XenDesktop Site as described in CTX235820.


  • An intermittent (observed when the Windows CEIP process runs nightly) StoreFront upgrade issue occurs during an upgrade from a 7.12 of later Delivery Controller. The following message is displayed:

    “StoreFront cannot be upgraded because the following program is using some files. Close the program and try again. Program name: CompatTelRunner”

    To work around this issue, follow the instruction in the message. [DNA-51341]

  • When upgrading a XenDesktop 5.6 deployment, group policy is missing. As a workaround, first upgrade from XenDesktop 5.6 to XenDesktop 7.13. Then upgrade to the current release. [DNA-44818]

  • When installing a Controller and you select I want to connect to Smart Tools and Call Home on the Smart Tools page of the installation wizard, Call Home might not be enabled. As a workaround, either use the schedule feature in Citrix Scout or enable Call Home using PowerShell. [CAM-9907]

  • If StoreFront was originally installed using the executable from the installation media, StoreFront does not appear as eligible for upgrade when you use the full-product installer for a later version. As a workaround, upgrade StoreFront using the executable from the installation media. [XAXDINST-43, DNA-47816]


  • Citrix Studio allows assignment of multiple Desktop Assignment Rules (DAR) for different users or user groups to a single VDA in the Delivery Group. StoreFront displays the assigned desktop with the corresponding Display Name as per the DAR for the logged in user. However, Director does not support DARs and displays the assigned desktop using the Delivery Group name regardless of the logged in user. As a result, you cannot map a specific desktop to a machine in Director.

    Workaround: To map the assigned desktop displayed in StoreFront to the Delivery Group name displayed in Director, use the following PowerShell command:

    Get-BrokerDesktopGroup | Where-Object { $\_.Uid -eq (Get-BrokerAssignmentPolicyRule | Where-Object { $\_.PublishedName -eq "\<Name on StoreFront\>" }).DesktopGroupUid } | Select-Object -Property Name, Uid

    [DNA 53578]

  • In exported PDF reports with Trends tab graphs generated for the last month time period having 28/30 days, the x-axis is not marked. This issue does not occur if the month has 31 days or when you export to Excel format. [DIR-184]


  • Multi-stream (with or without multi-port) and session reliability UDP transport information might appear incorrectly as inactive in the HDX monitor or in Director. This might occur when a session is using the multi-stream or multi-port with UDP transport. [HDX-13416]

  • A stop error (blue screen) is intermittently observed during the installation of a 7.16 VDA on a Surface Pro 3 or 4. During installation, the Intel driver igdkmd64 stops responding. This is a third-party issue that impacts Intel GPUs: Intel 5000 HD, and Intel Iris 530. [HDX-12662]

  • Windows Event Log Error: “Windows is unable to verify the image integrity of the file MfApHook64.dll”. For more information, see CTX226397. [HDX-9063]

  • When you start an application from StoreFront, the application might not start in the foreground or the application is in the foreground but might not have focus. As a workaround, click the icon in the task bar to bring the application to the front or in the application screen to bring it to focus. [HDX-10126]

  • When you delete an Azure Resource Manager machine catalog, the associated machines and resource groups are deleted from Azure, even if you indicate that they should be retained. [DNA-37964]

  • Multicast might fail to display video when using Citrix Receiver for Windows newer than version 4.6. Audio is still available. As a workaround, add this registry key on the endpoint:

    Name: DisableVMRSupport Type: DWORD Value: 4 [#HDX-10055]

  • When LogonUISuppression is enabled, users have these issues:
    • Users attempting smart card authentication cannot log on to use their published applications.
    • Users are unable to change their passwords using CTRL+F1 » Change password, and they cannot unlock their machine after locking their session using CTRL+F1 » Lock.

    As a workaround, disable LogonUISuppression. [HDX-11413, HDX-12465]

  • When a user starts a published application and immediately starts a desktop (or tries the reverse order), the second request might fail with the following error message: “The task you are trying to do can’t be completed because Remote Desktop Services is currently busy. Please try again in a few minutes. Other users should still be able to log on.” As a workaround, retry after a few seconds. [HDX-12492]

  • After installing the Skype for Business Web App Plug-in, webcams might not be enumerated and meeting pages on Firefox might not refresh automatically. [HDX-13288]

  • When playing a video in full screen mode with H.265 selective encoding enabled, the video might become corrupted and on certain occasions, sessions might disconnect. As a workaround, disable H.265 encoding. [HDX-14363]


  • Universal Print Server printers selected on the virtual desktop do not appear in the Devices and Printers window in Windows Control Panel. However, when users are working in applications, they can print using those printers. This issue occurs only on the Windows Server 2012, Windows 10 and Windows 8 platforms. For more information, see Knowledge Center article CTX213540. [HDX-5043, 335153]

  • The default printer might not be marked correctly in the printing dialog window. This issue does not affect print jobs sent to the default printer. [HDX-12755]

Third-party issues

  • A VDA running on Azure might freeze, requiring a session reconnect. As a workaround, set udtMSS=1400 and OutbufLength=1400 in Azure environments. [HDX-12913]

  • After starting a YouTube video using the YouTube HTML5 video player, full-screen mode might not work. You click the icon in the lower-right corner of the video, and the video doesn’t resize leaving the black background in the full area of the page. As a workaround, click the full screen button, and then select theater mode. [HDX-11294]

Known issues