Filename: ICATS760WX64053.msp
For: XenApp 7.6; XenDesktop 7.6 VDA Core Services for Windows Server OS (64-bit). or operating system requirements, see System Requirements on the Citrix Product Documentation site.
Replaces: ICATS760WX64031
Date: February, 2016
Languages supported: English (US), German (DE), Spanish (ES), French (FR), Japanese (JA), Simplified Chinese (SC)
Readme version: 1.01

Readme Revision History

Important Note(s)

• This software update was originally released before March 18, 2016. Effective January 1, 2016, Microsoft deprecated the SHA-1 certificate Citrix used to code sign this update. This rerelease of the update uses the requisite replacement certificate. No other changes were made to the update. If you installed this update before the March 18, 2016 rerelease, there is no need for you to reinstall it.
• This release is based on XenApp 7.6/XenDesktop 7.6 VDA Core Services for Windows Server (64-bit). It patches only systems where Version 7.6 of the product is installed. Any known issues in Version 7.6 of the product, except for the specific issues resolved in this limited release, still apply.
• You can upgrade the VDA from a console session or from an RDP session. Upgrading from within an ICA session is not supported.
• Caution! This release may require you to edit the registry. Using Registry Editor incorrectly can cause serious problems that may 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.

Where to Find Documentation

This document describes the issue(s) resolved by this release and includes installation instructions. For additional product information, including supported operating systems and system requirements, see XenApp and XenDesktop 7.6 on the Citrix Product Documentation site.

New Fixes in This Release

1. With USB Redirection disabled, disconnecting from a published application can cause the following, spurious Event 261 to appear in the Event Viewer:

   "The Citrix Device Redirector service could not complete an IO operation with the Redirector Bus."

   [From ICATS760WX64053][#LC3439]

2. The Citrix Device Redirector service might fail to complete an I/O operation and the following error message appears in the Event Viewer:

   "The Citrix Device Redirector service could not complete an IO operation with Redirector Bus."

   [From ICATS760WX64053][#LC3497]

3. Attempts to restart the Citrix Device Redirector Service from within a VDA or RDP session can cause the service to remain in an unresponsive state rather than actually restarting.

   [From ICATS760WX64053][#LC3544]

4. With Generic USB Redirection enabled, each time a generic redirected USB device is physically disconnected and reconnected within a session, it is treated as a new device. As a result, each time you reconnect such a USB device, an additional GUID is created for it.

   [From ICATS760WX64053][#LC4259]

Fixes from Replaced Hotfixes

1. The VDA servers experience an error on icausbb.sys due to a null pointer and a blue screen appears with bugcheck code 0xc0000005.

   [From ICATS760WX64031][#LC2772]

2. Servers might experience an error on icausbb.sys and with the message PNP_DETECTED_FATAL_ERROR appearing on a blue screen.

   [From ICATS760WX64031][#LC2811]

3. After applying Fix #LC2772, USB redirection might stop working.

   [From ICATS760WX64031][#LC3250]

Installing and Uninstalling this Release

Notes:

• This release is packaged with Microsoft Windows Installer 3.0 as a .msp file. For more information about deploying .msp files, see Microsoft article 884016 or visit the Microsoft Web site and search on keyword msiexec.
• This installer program complies with Microsoft User Account Control (UAC). If UAC is enabled, you must run the installer program in elevated mode; that is, with administrative privileges enabled. For more information about UAC, see Microsoft TechNet or visit the Microsoft Web site and search on keyword UAC.
• To install this release successfully, computers must not have registry modification restrictions in place.
• Slipstreaming - installations of the VDA for Windows Server OS base product packaged with one or more individual hotfixes - is not supported and might leave servers in an unstable state.
• You must restart the server after the installation of this hotfix completes. However, if you are installing multiple hotfixes at the same time, there is no need to restart the server after the installation of each hotfix. It is sufficient to restart the server after the installation of the final hotfix completes.
• If the need arises to restore the original settings and functionality provided by this release, you must uninstall the release before reinstalling it according to the installation instructions below.

To install this release:

1. Copy the release package to an empty folder on the hard drive of the computer you want to update.
2. Close all applications.
3. Run the executable.
4. Restart the computer.

To uninstall this release:

1. From the Start menu, select Control Panel > Programs and Features.
2. Highlight the release you want to uninstall and click Uninstall.
3. Follow the directions on-screen.

Files Updated (All Dates/Times UTC)