Define the Scope of Management to include the computers that you wish to manage using Desktop Central
Ensure that you have enabled ActiveX Controls in the Internet Explorer browser settings through which you are trying to connect to a remote desktop.
If Windows firewall is running in the remote desktop, add TCP port 6100 to the exceptions list. This has to be done in all the remote computers that you wish connect.
Click Desktop Sharing from the Quick Links provided below the tabs.