Power Management on the corresponding NIC has been disabled.Furthermore regard these best practices for your servers: Locate and fix a possible Black Hole Router. Such a router is sometimes known as a “black hole” router.” “On a TCP/IP-based wide area network (WAN), communication over some routes may fail if an intermediate network segment has a maximum packet size that is smaller than the maximum packet size of the communicating hosts–and if the router does not send an appropriate Internet Control Message Protocol (ICMP) response to this condition or if a firewall on the path drops such a response.
There are several that could have caused the issue.Ī majority of them are related to drive mappings or folder redirections in logon scripts, user profiles and/or GPOs, which point to an incorrect location or experience delays mapping during the logon process.
Secure Boot is enabled on your Hyper-V Server for the affected VM. having HDX 3D Pro enabled on a physical host during installation of the VDA though not having a compatible graphics card inside. having ghost devices in Device Manager resulting in orphaned drivers on your Windows Server OS. wrong graphics card driver in VM when using VMware as a Hypervisor. 
network issues between XenDesktop Worker hosting VDA and NetScaler/StoreFront. This can happen due to the following reasons: Having a look into the Citrix\Device\Redirector Application Log in Event Viewer showed an Event ID 261, Event Source: Redirector:Ĭitrix Device Redirector service could not complete an I/O Redirector Bus operation. In my case the error started showing up after moving the VM from one Hyper-V server to another Hyper-V server. Everything seems to look and work as expected. There are no significant Warnings and/or Error messages in the corresponding server’s Application and/or System Event Log. Whereas connecting with RDP works normally, as long as the users are members of the local group Direct Access Users. When connecting to a Windows Server 2008 R2 Published Desktop (provisioned as a VM, not a physical machine) with XenDesktop 7.x you might receive a black and blank Desktop, no Desktop Icons are shown, and the Desktop stays that way: 
Citrix XenDesktop 7.x – Black Screen when connecting to Published Desktop
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