Citrix Remote Pc
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Applicable Products

- XenApp
Symptoms or Error
After uninstalling XenApp 6.x /7.x RDS VDA from a Server 2008 R2 or 2012 R2 server attempts to RDP to the server fail with the following error:
“Remote Desktop can't connect to the remote computer for one of these reasons:
- Remote access to the server is not enabled
- The remote computer is turned off
- The remote computer is not available on the network

Solution
To resolve the issue, edit the following registry:
Caution! Refer to the Disclaimer at the end of this article before using Registry Editor.
Start regedit.
Complete the following steps locally if you have console access to the affected server. If you do not have console access to the server, connect remotely opening regedit on another server and click File > Connect Network Registry, enter the affected XenApp server name and click OK.
The registry of the affected server appears.Go to HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlTerminal ServerWinstationsRDP-Tcp. There are two values of significance:
CitrixBackupRdpTcpLoadableProtocolObject (REG_SZ)
LoadableProtocol_Object (REG_SZ)
Citrix Remote Pc Access Pricing
For W2K8R2, copy the value of CitrixBackupRdpTcpLoadableProtocolObject (must be {18b726bb-6fe6-4fb9-9276-ed57ce7c7cb2}) to LoadableProtocol_Object.
For W2K12R2, copy the value of CitrixBackupRdpTcpLoadableProtocolObject (must be {5828227c-20cf-4408-b73f-73ab70b8849f}) to LoadableProtocol_Object.
Restart the Remote Desktop Services service on the affected machine. This can also be done remotely, open the Services Console on another server and right-click Services (Local), then select Connect to another computer, enter the name of the affected server, and click OK.
RDP must work as expected.Delete the CitrixBackupRdpTcpLoadableProtocolObject value.
Problem Cause
The installation of XenApp 6.x or 7x RDS VDA modifies the RDP connection in the registry.
In HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlTerminal ServerWinstationsRDP-Tcp, the value of LoadableProtocol_Object is modified to RPM.CtxRdpProtocolManager. The original value of '{18b726bb-6fe6-4fb9-9276-ed57ce7c7cb2}' is stored in CitrixBackupRdpTcpLoadableProtocolObject for W2K8R2 and ‘{5828227c-20cf-4408-b73f-73ab70b8849f}’ for W2K12R2. When uninstalling XenApp 6.x or 7x VDA, this original value must be copied back to LoadableProtocol_Object, but sometimes the original settings are not restored.