You must set some minimum permissions in the VCenter application to allow CC-SG to access VCenter and manage the nodes and interfaces associated with it.
In addition, Virtual Machine > Interation > Device Connection should be provided to be able to connect/disconnect media and network devices from the VMware Remote Console.
When using the Internet Explorer browser with VMware 5.1 virtual machine nodes, you must add the CC-SG IP address to the browser's Trusted Sites Internet Zone for successful connections.
See also Install the VMware Remote Console Plugin Manually When VCenter is Not Added.