This blog describes how to change the Virtual Channel Priorities in the VDA in XenDesktop 5 and above and it also has which
Virtual channels are used within an ICA connection exchange specific types of information between a client and server application. A few of the Virtual Channels implemented by Citrix are sound, graphics, CDM, USB, and printing. Based on different user scenarios, Virtual Channels priorities may need to be changed to lessen interactions between different types of content. This article describes how to change priorities of Virtual Channels in XenDesktop 5.
Remote Session Screen Update (THINWIRE) - CTXTW ,0
Seamless Windows Screen Update (THINWIRE) - CTXTWI ,0
Clipboard - CTXCLIP,1
Client Audio Mapping - CTXCAM ,1
License Management - CTXLIC ,1
Video Server (Dead – Remember VideoFrame ?) - CTXVFM ,1
Program Neighborhood - CTXPN ,1
CTXSBR ,1
Windows Media Redirection - CTXMM ,1
Flash - CTXFLSH,1
USB - CTXGUSB,1
Smart Cards - CTXSCRD,1
Still cant find this one - CTXCTL ,1
End User Experience Monitoring - CTXEUEM,1
Client COM Port Mapping - CTXCCM ,2
Client Drive Mapping - CTXCDM ,3
Client Management (Auto-Update) - CTXCM ,3
Printer Mapping for Non-Spooling Clients - CTXLPT1,3
Printer Mapping for Non-Spooling Clients - CTXLPT2,3
Printer Mapping for Non-Spooling Clients - CTXCOM1,3
Printer Mapping for Non-Spooling Clients - CTXCOM2,3
Printer Mapping for Spooling Clients (nearly all) - CTXCPM ,3
OEMOEM2,3
OEMOEM ,3
If you want to implement these virtual channels on a VDA add the following regkey
HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\GroupPolicy\Defaults\
Then create a MULTI_SZ named “VirtualChannelPriority” with the following contents but change these to your requirements:
CTXTW ,0
CTXTWI ,0
CTXCLIP,1
CTXCAM ,1
CTXLIC ,1
CTXVFM ,1
CTXPN ,1
CTXSBR ,1
CTXMM ,1
CTXFLSH,1
CTXGUSB,1
CTXSCRD,1
CTXCTL ,1
CTXEUEM,1
CTXCCM ,2
CTXCDM ,3
CTXCM ,3
CTXLPT1,3
CTXLPT2,3
CTXCOM1,3
CTXCOM2,3
CTXCPM ,3
OEMOEM2,3
OEMOEM ,3
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