Terminal services manager does not exist in Windows 8. But fear not, the Remote Desktop Services Manager will do the trick. To actually enable the feature go to,
“Programs and Features”,
“Turn Windows Features on or off”:
“Remote Server Administation Tools”,
“Role Administration Tools”,
and enable “Remote Desktop Services Tools”.
Now you’ll find the Remote Desktop Services Manager in your start menu and can start kicking out remote desktop connections from your servers.