This version of the connector is no longer supported.

Check the Cloud Connector logs and refer to the solutions provided below.

By default Cloud Connector logs are located in the "C:\ProgramData\Citrix\WorkspaceCloud\Logs" directory
 

Logs	Solution
Cloud Connector CWCConnector Logs: ---> (Inner Exception #0) System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: The remote name could not be resolved: 'agenthub.citrixworkspacesapi.net'	Ensure the server is connected to the Internet.     Ensure the DNS (agenthub.citrixworkspacesapi.net) is resolving correctly. Run the Connectivity Check tool
Cloud Connector CWCConnector Logs: ---> (Inner Exception #0) System.AggregateException: One or more errors occurred. ---> System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 192.168.1.20:80	Incorrect Proxy Configured Check for the type of user account used to enable the web proxy Run the Connectivity Check tool   Note: The following Web Sites should be accessible on the Cloud Connector Server. https://*.citrixworkspacesapi.net  https://*.cloud.com  https://cwsproduction.blob.core.windows.net/downloads https://*.servicebus.windows.net https://login.citrixonline.com https://*.amazonaws.com/
Cloud Connector CWCConnector Logs: ---> (Inner Exception #0) System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 192.168.1.21:443	Incorrect entry under Hosts file. Ensure there is no incorrect IP address assigned to ‘agenthub.citrixworkspacesapi.net’ in the hosts file.

Identity workspace is used for all communication between XenMobile Service and on premise cloud connector. Refer below link to further troubleshoot XenMobile Service. The specified link contains all the API's used with the Identity workspace. 
https://core.citrixworkspacesapi.net/Help

New Azure Active Directory Support for Citrix Cloud Administrators.
https://www.citrix.com/blogs/2017/01/09/new-azure-active-directory-support-for-citrix-cloud-administrators/

Cloud Connector Check Utility CTX260337  

Cloud Connector Troubleshooting Guide CTX221535

Citrix Cloud Connector Requirements