The following Citrix and Microsoft hotfixes are found to resolve the most common issues with XenApp/XenDesktop 7.6, and XenApp/XenDesktop 7.5 running on a Windows Server 2008 R2 or a Windows Server 2012 R2 platform. These hotfixes focus on basic functionality and stability. 
Note :
1. Fixes for Current Releases will likely be released in the next Current Release; therefore, it is less likely that an individual fix would be released for a Current Release version. You may be asked to upgrade to the next version of a Current Release that includes the requested fix and new functionality.
2. This article aims to describe the recommended hotfixes before Citrix LTSR(7.6.300) and Citrix CR(7.7~7.14). Please go to docs.citrix.com for more hotfixes regarding LTSR and CR.

XenApp 7.6

Issue: 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.  
Available Software Updates:

ICAWS760WX64047 - For VDA Core Services 7.6 for Windows Desktop OS (64-bit) - English

ICAWS760WX86047 - For VDA Core Services 7.6 for Windows Desktop OS (32-bit) - English

ICATS760WX64053 - For VDA Core Services 7.6 for Windows Server OS (64-bit) - English

Issue:

• The operating system experiences an error on picadm.sys and a blue screen appears with stop code 0x20.
• A deadlock on picadm.sys can cause published applications to become unresponsive.
• The operating system experiences an error on picadm.sys and a blue screen appears with stop code 0x50.
• The VDA might become unresponsive at the "Welcome" screen due to a deadlock on picadm.sys.  
• Remote Desktop (RDP) connections to the server fail.

Available Software Update:

ICATS760WX64048 - For VDA Core Services 7.6 for Windows Server OS (64-bit) - English

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Issue: Certain third-party published applications might fail to start on XenApp servers. As a result, the wfshell.exe process might close unexpectedly. When this error occurs, no indication that the session is starting or error messages appear on the user device.
Available Software Updates:

ICAWS760WX64042 - For VDA Core Services 7.6 for Windows Desktop OS (64-bit)-English

ICAWS760WX86042 - For VDA Core Services 7.6 for Windows Desktop OS (32-bit) - English

ICATS760WX64040 - For VDA Core Services 7.6 for Windows Server OS (64-bit) - English

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Issue: Citrix XenApp 7.6 and XenDesktop 7.6 VDA Core Services running on Windows Server 2008 R2 (Server OS) might become unresponsive at the "Welcome" screen. If this occurs, new Receiver and Remote Desktop (RDP) connections to the server fail.
Available Software Updates:

ICAWS760WX64026 - For VDA Core Services 7.6 for Windows Desktop OS (64-bit) - English

ICAWS760WX86026 - For VDA Core Services 7.6 for Windows Desktop OS (32-bit) - English

ICATS760WX64032 - For VDA Core Services 7.6 for Windows Server OS (64-bit) - English

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Issue: The Citrix Stack Control service quits unexpectedly if there is an invalid session key.
Available Software Update:

ICATS760WX64006 - For VDA Core Services 7.6 for Windows Server OS (64-bit) - English

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XenApp 7.5/ 7.1

Issue:

• The memory consumption of the Monitoring Service can grow steadily until the service stops responding to requests from Director, eventually rendering Director unresponsive as well.
• If the resource name (display name) changes on the Delivery Controller, users who previously subscribed to the applications cannot start the applications.
• If you create virtual machines (VM) with Desktop Studio that uses Machine Creation Services and the VMs are hosted on a VMware hypervisor, attempts to update VMs that are part of the machine catalog fail.

Available Software Updates:

Update 3 - For Citrix XenDesktop 7.1 Delivery Controller x64 - English

Update 3 - For Citrix XenDesktop 7.1 Delivery Controller x86 - English

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Issue:

• VDAs can becomes stuck in the "initializing" state of registration process. The issue occurs after the Citrix Desktop Service is running for several days without being restarted.
• When the function "CName" is enabled, VDA registration can take excessively long.

Available Software Updates:

BrokerAgent750WX64003 - For Broker Agent 7.1/7.5 for Windows OS (64-bit) - English

BrokerAgent750WX86003 - For Broker Agent 7.1/7.5 for Windows OS (32-bit) - English

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Issue: Installing hotfixes for XenApp 7.5, and XenDesktop 7.1 and 7.5 VDA Core Services for Windows Desktop and Server OS released before September 2014 causes the ICA Session performance monitor counter to be removed. This can have an adverse effect on the operation of tools and processes that rely on these counters.

Available Software Updates:

ICAWS750WX64011 - For VDA Core Services 7.1/7.5 for Windows Desktop OS (64-bit) - English

ICAWS750WX86011 - For VDA Core Services 7.1/7.5 for Windows Desktop OS (32-bit) - English

ICATS750WX64011 - For VDA Core Services 7.1/7.5 for Windows Server OS (64-bit) - English

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Issue:The Citrix Print Manager Service (CpSvc.exe) process might exit unexpectedly.

Available Software Updates:

ICAWS750WX64019 - For VDA Core Services 7.1/7.5 for Windows Desktop OS (64-bit) - English

ICAWS750WX86019 - For VDA Core Services 7.1/7.5 for Windows Desktop OS (32-bit) - English

ICATS750WX64019 - For VDA Core Services 7.1/7.5 for Windows Server OS (64-bit) - English

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Issue:

• This fix addresses an intermittent high memory utilization issue of the Broker Service on the Controller.
• This fix addresses a memory consumption issue of the Monitoring Service.

Available Software Updates:

Update 3 - For Citrix XenDesktop 7.1 Delivery Controller x64 - English

Update 3 - For Citrix XenDesktop 7.1 Delivery Controller x86 - English

Note:

Refer to the complete list of all the available HotFixes for
XenApp 7.6  64-bit  32-bit
XenApp 7.5  64-bit  32-bit

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Microsoft HotFixes (including links to Microsoft HotFix list)

Windows Server 2012 R2 contains most of the following hotfixes (exceptions noted inline). Microsoft has published the following KB article specific to Remote Desktop Services:  Available Updates for Remote Desktop Services (Terminal Services) in Windows Server 2012 R2. For Microsoft Hotfixes applicable to the Windows Server 2008 R2 and the Windows 7 platforms, see the “Microsoft Hotfixes” section in the following article: CTX129229 - Recommended Hotfixes for XenApp 6.x on Windows Server 2008 R2.

Note: The descriptions of the Microsoft fixes listed in this article (CTX142357) might not match the descriptions in the Microsoft articles for the following Microsoft fixes. This is not an error. The issue description listed by Citrix in the following matrix was resolved by an earlier version of that file however it has been superseded by the article/fix currently listed.

KB Number	Issue description
KB3033929	UPM driver load breaks if this KB is not applied.
KB3078676 - NEW	This article describes an issue in which even 1530 is logged, and user profile service (ProfSvc) leaks paged pool memory and handles in Windows 8.1, Windows RT 8.1, or Windows Server 2012 R2. This issue occurs if the ProfSvc service loads and then unloads a user profile. Additionally, the following event is logged in the Event viewer: Event ID 1530. Description: Windows detects your registry file is still in use by other applications or servers. The file will be unloaded now. The applications or services that hold your registry file may not function properly afterwards. No user action is required.
KB3127673 - NEW	The Stop error 0x000000C2 might be caused by an error handling issue in the win32k.sys file. The Stop error 0x0000003B might be caused by a synchronization issue in the dcgkrnl.sys file. The parameters in Stop error messages may vary, depending on the configuration of the computer. Not all "Stop 0x000000C2" errors or "Stop 0x0000003B" errors are caused by one of these issues.
KB3055615 - NEW	A windows Server 2012 R2 Server becomes slow and unresponsive if update 2927901 is installed. You have update 2927901 installed on a Windows Server 2012 R2 server. You have users who frequently log in and log off the server through Remote Desktop.
KB3013769	Memory leak occurs when you create or delete CSV snapshots by using a VSS hardware provider IIS crashes occasionally when a request is sent to a default document in Windows 8.1 or Windows Server 2012 R2 You receive Stop error 0xD1 in Windows Server 2012 R2 or Windows 8 Device does not exist error after you reinsert a USB COM port device
KB2978367	Remote Desktop session freezes when you run an application in the session in Windows 8.1 or Windows Server 2012 R2.
KB2967077	A network printer is deleted unexpectedly in Windows
KB2895698	Users who have the remote audio setting enabled cause the RD Session Host servers to freeze intermittently in Windows Server 2012 R2 or Windows Server 2008 R2 SP1
KB2896328	You are logged on with a temporary profile to a remote desktop session after an unexpected restart of Windows Server 2012
KB2852483	Memory leak occurs in the Dwm.exe process on a Remote Desktop computer that is running Windows 8 or Windows Server 2012
KB2995388	Memory leak occurs when you play mp4 files in Windows 8.1 or Windows Server 2012 R2 Computer freezes when you switch to another account in Windows 8.1 or Windows Server 2012 R2 An NTFS volume is flagged as dirty after each restart, and CHKDSK can find no issues Print jobs are intermittently processed slowly through Windows 8.1-based or Windows Server 2012 R2-based printer servers Network printers that use TCP/IP port cannot print after first document has printed in Windows

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This article describes the recommended hotfixes for XenApp 7.x