Unable to log on to published desktop

Users are getting the following error when they are trying to log on to published desktop.

"Windows Could not connect to the group policy client service."



Logged on to each citrix server ( total 8 ) and checked the group policy services is started or not. Found that gp client services is not started on one server
prohibited logons on that one server through citrix app center. 
rebooted the server
enabled logons on that one server again through citirx app center
logged into the server and checked the services and gp client services was started successfully. 

Issue resolved, users were able to log in with out any issues.


On the other hand, i also checked the following troubleshooting.

There are two places to look in the registry:

1. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services this path should contain gpsvc key (a folder), which is responsible for service parameters and configuration.  I found that the key wasintact, so, you do not touch anything here.
2. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SVCHOST This is the most important path you should look into, as it must contain the keys and values referred in the key #1.  Below are descriptions what must be present there.

• There must be Multi-String value called GPSvcGroup. My laptop was missing it.  So, you should create multi-string value named GPSvcGroup and assign it value GPSvc.
• Next, you must create a key (a folder) and name it GPSvcGroup
• Then open newly-created GPSvcGroup folder and create 2 DWORD values:

1. First called AuthenticationCapabilities and you must give it a value of 0x00003020 (or 12320 in decimal)
2. Second is called CoInitializeSecurityParam and it must have value of 1.

Once you completed all steps above, reboot the computer and the problem will be fixed.

Thank you 
Kesavapani Patnala