DPI Settings in an RDP/ICA Session on Windows Server 2008 R2 andWindows 7

In quite a few XenApp 6/6.5 Projects the Customer complained that the Users were not able to change the DPI Size when connected to a XenDesktop running Windows 7 or a XenApp Desktop hosted on Windows Server 2008 R2. This was due to a limitation in the Remote Desktop Services Stack from Microsoft.

There were some Workarounds with importing/injecting Values into the Registry for those Users to change the DPI Size but they were far from perfect.

Microsoft just recently released an Hotfix to enable the Adjustment of the DPI Size over Remote Desktop Protocol Sessions like RDP and ICA. You can find and download the Hotfix here:

http://support.microsoft.com/kb/2726399/en-us

And this is how the new DPI Menu looks (on a German Windows Server 2008 R2):

Citrix Clipboard Redirection causes Session Disconnect

This week I had to troubleshoot a Problem where a lot of Copy and Pasting in a published Desktop caused the XenApp Session to freeze or disconnect.

The Customer reported a Problem where some of his Users were getting disconnected as soon as they ran a specific Excel Macro. At first I suspected that the Macro used some kind of Screen Refresh or something similar which would cause the ICA/HDX Session to disconnect or frezze but the Macro only involved copy and pasting a lot of information in quick succession. That led me to focus on the Clipboard Redirection because everytime I copied a large amount of Data my Session frozze up.

Solution: We finally fixed the Session Disconnects by disabling the Clipboard Redirection via Citrix Policies because the Customer solely relies on published Desktops and therefore he doesnt need to copy and paste things between the XenApp Systems and the Endpoints.

If you need the Clipboard Redirection to be enabled and want to avoid the Session Disconnects/Freezes you should try the new Citrix Receiver 3.1 Cumulative Update 1 or downgrade to the Online Plug-in 12.x.

Note: This Problem should also apply to XenDesktop as long as you use the Receiver 3.0 or 3.1 which seems to be affected with this "Clipboard Redirection Bug".

Update: This should be fixed in the Receiver 3.2 aka Online Plug-in 13.1.200.x or later.